{"id":4400,"date":"2021-11-23T19:00:46","date_gmt":"2021-11-23T19:00:46","guid":{"rendered":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/?page_id=4400"},"modified":"2021-11-25T13:18:11","modified_gmt":"2021-11-25T13:18:11","slug":"area-of-the-circular-ring-with-examples-and-faqs","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/area-of-the-circular-ring-with-examples-and-faqs\/","title":{"rendered":"Area of the circular ring &#8211; with Examples and FAQs"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Section&#8221; module_class=&#8221;mainsec&#8221; _builder_version=&#8221;4.10.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#e0f2fd&#8221; z_index=&#8221;1&#8243; custom_padding=&#8221;5px||5px||true|false&#8221; locked=&#8221;off&#8221; collapsed=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_5,2_5&#8243; custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.10.8&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|51px|40px|51px|false|true&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;|40px|30px|40px|false|true&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_5&#8243; admin_label=&#8221;Column L&#8221; _builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Acute Angles<br \/>\n&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_font_size=&#8221;50px&#8221; header_line_height=&#8221;1.18em&#8221; custom_padding=&#8221;|0px||4px|false|false&#8221; hover_enabled=&#8221;0&#8243; header_font_size_tablet=&#8221;&#8221; header_font_size_phone=&#8221;35px&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h1>Area of the Circular Ring &#8211; with Examples and FAQs<\/h1>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;#a01414&#8243; header_3_font=&#8221;|600|||||||&#8221; custom_padding=&#8221;15px|15px|54px|4px|false|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h2><b>Area of a circular ring<\/b><\/h2>\n<p>Two concentric circles of different diameters form a circular ring (an annulus), which is a two-dimensional figure. For example, a washer&#8217;s top and bottom surfaces and the cross-section of a concrete pipe are examples of annuli. The annulus is the region between the two circles.<\/p>\n<p>\u00a0It is the coloured portion as shown in the figure:-<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/a1.png\" width=\"349\" height=\"217\" alt=\"\" class=\"wp-image-4403 alignnone size-full\" style=\"display: block; margin-left: auto; margin-right: auto;\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><b><i>What is the area of the ring?<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">We know the area of a circle is given by \u03c0(x)\u00b2, where &#8216;x&#8217; is the radius of the given circle.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Radii R and r specify the dimensions<\/span> <span style=\"font-weight: 400;\">of the outer and inner circles respectively<\/span><span style=\"font-weight: 400;\">.<\/span><span style=\"font-weight: 400;\"> To find the area of a circular ring, we can subtract the area of the inner circle from that of the outer circle.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For calculating the area of an annulus, use the following formula.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Area of the circular ring (Annulus) = <\/span><i><span style=\"font-weight: 400;\">A <\/span><\/i><span style=\"font-weight: 400;\">= <\/span><i><span style=\"font-weight: 400;\">\u03c0<\/span><\/i><span style=\"font-weight: 400;\">(<\/span><i><span style=\"font-weight: 400;\">R<\/span><\/i><span style=\"font-weight: 400;\">\u00b2\ufe63<\/span><i><span style=\"font-weight: 400;\">r<\/span><\/i><span style=\"font-weight: 400;\">\u00b2)<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Derivation of the area of the ring<\/strong><br \/><\/span><\/p>\n<p>It is possible to find the area of the circular ring by measuring the area of the outer circle and the inner circle. To get the answer, we need to subtract the area of the inner circle from that of the outer circle<\/p>\n<p>We&#8217;ll use &#8220;R&#8221; for the outer circle&#8217;s radius and &#8220;r&#8221; for the inner circle&#8217;s radius.<\/p>\n<p>Therefore,<\/p>\n<p><span style=\"font-weight: 400;\">Outer circle area <span class=\"katex-eq\" data-katex-display=\"false\">=\\pi R^{2}<\/span><br \/><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Inner circle area <span class=\"katex-eq\" data-katex-display=\"false\">=\\pi r^{2}<\/span><\/span><\/p>\n<p><span>In other words, the area of the annulus is the <\/span><span>difference between the areas of outer and inner circles.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence, Its area is equivalent to:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">A r=A-a=\\pi R^{2}-\\pi r^{2}=\\pi\\left(R^{2}-r^{2}\\right)=\\pi(R-r)(R+r)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span>Where,\u00a0<\/p>\n<p><i><span style=\"font-weight: 400;\">Ar = area of the circular ring,<\/span><\/i><\/p>\n<p><i><span style=\"font-weight: 400;\">A = area of the outer circle,<\/span><\/i><\/p>\n<p><i><span style=\"font-weight: 400;\">a\u00a0 = area of the inner circle.\u00a0<\/span><\/i><\/p>\n<p>&nbsp;<\/p>\n<h2>Examples<\/h2>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">1. A 14 cm broad path surrounds a circular lawn with a 360 cm diameter. Find the area of the path.(Use \u03c0 value of 22\/7)<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Given:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The radius of the inner circle (r) <\/span><span style=\"font-weight: 400;\">= 180 cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Radius of outer circle (R) <\/span><span style=\"font-weight: 400;\">=(180 + 14) = 194 cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2234<\/span><span style=\"font-weight: 400;\"> The area of path\u00a0 <\/span><span style=\"font-weight: 400;\">= \ud835\udf0b(\ud835\udc45 \u2013 \ud835\udc5f)(\ud835\udc45 + \ud835\udc5f)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"katex-eq\" data-katex-display=\"false\">= \\frac{22}{7}\\times (194 +180)(194-180)<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"katex-eq\" data-katex-display=\"false\">=16456 \\mathrm{~cm}^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence the area of the path is 16456 cm\u00b2.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<h3><span style=\"font-weight: 400;\">2. A circular path has an outer diameter of 728 m and an inner diameter of 700 m. Find the circumference and the area of the circular path. (Use \u03c0 value of 22\/7)<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A circular path has an outside <\/span><span style=\"font-weight: 400;\">diameter of 728 m.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, its radius (R) = (728\/2) = 364 m<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The inner diameter = 700 m<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, the inner radius (r) = (700\/2) = 350 <\/span><span style=\"font-weight: 400;\">m.<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hence, the circumference \/ breadth of the circular path is equal to (R &#8211; r) = 364 &#8211; 350 = 14m.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Circular path area (<\/span><i><span style=\"font-weight: 400;\">\ud835\udc34)<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400;\">= <\/span><i><span style=\"font-weight: 400;\">\ud835\udf0b<\/span><\/i><i><span style=\"font-weight: 400;\">(R + r)(R &#8211; r)<\/span><\/i><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 22\/7(364 + 350) (364 &#8211; 350)<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">= (22\/7) x 714 x 14<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= ( 22 x 714 x 2 )<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is equivalent to 31,416 m\u00b2.<br \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">In other words, the circular walkway has a surface area of 31416 m \u00b2.<br \/><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; module_id=&#8221;stickysideR&#8221; admin_label=&#8221;Column R&#8221; _builder_version=&#8221;4.10.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#fdefe0&#8243; custom_padding=&#8221;25px|25px|25px|25px|true|true&#8221; sticky_position=&#8221;top&#8221; sticky_offset_top=&#8221;-280px&#8221; sticky_limit_top=&#8221;row&#8221; sticky_limit_bottom=&#8221;row&#8221; sticky_position_tablet=&#8221;none&#8221; sticky_position_phone=&#8221;none&#8221; sticky_position_last_edited=&#8221;on|desktop&#8221; sticky_limit_bottom_tablet=&#8221;&#8221; sticky_limit_bottom_phone=&#8221;&#8221; sticky_limit_bottom_last_edited=&#8221;on|phone&#8221; border_radii=&#8221;on|15px|15px|15px|15px&#8221; box_shadow_style=&#8221;preset3&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/eistudymaterial.s3.amazonaws.com\/1080&#215;1080.png&#8221; alt=&#8221;Free Trial banner&#8221; title_text=&#8221;Mindspark Free Trial Banner&#8221; url=&#8221;https:\/\/mindspark.in\/free-trial&#8221; align=&#8221;center&#8221; module_class=&#8221;adsimg&#8221; _builder_version=&#8221;4.11.1&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||||false|false&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221; transform_styles__hover_enabled=&#8221;on|hover&#8221; transform_scale__hover_enabled=&#8221;on|hover&#8221; transform_translate__hover_enabled=&#8221;on|desktop&#8221; transform_rotate__hover_enabled=&#8221;on|desktop&#8221; transform_skew__hover_enabled=&#8221;on|desktop&#8221; transform_origin__hover_enabled=&#8221;on|desktop&#8221; transform_scale__hover=&#8221;102%|102%&#8221;][\/et_pb_image][et_pb_text admin_label=&#8221;Explore Other Topics<br \/>\n&#8221; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;|700|||||||&#8221; header_font_size=&#8221;25px&#8221; text_orientation=&#8221;center&#8221; custom_margin=&#8221;0px||0px||true|false&#8221; custom_padding=&#8221;8px|15px|0px|15px|false|true&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Explore Other Topics<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.10.7&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;2.2em&#8221; link_font_size=&#8221;16px&#8221; custom_margin=&#8221;||0px||false|false&#8221; custom_padding=&#8221;10px|15px|10px|28px|true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#geometry\" class=\"otherc\">Geometry<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#trigonometry\" class=\"otherc\">Trigonometry<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#operations\" class=\"otherc\">Operations<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#numbers\" class=\"otherc\">Numbers<\/a><\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;Row for space&#8221; _builder_version=&#8221;4.10.6&#8243; _module_preset=&#8221;default&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; 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title_text=&#8221;down-circle&#8221; show_bottom_space=&#8221;off&#8221; align=&#8221;right&#8221; module_class=&#8221;img2&#8243; _builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; width=&#8221;44px&#8221; height=&#8221;18px&#8221; custom_padding=&#8221;2px||2px||true|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;FAQ Row&#8221; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|40px||40px|false|true&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;FAQ&#8221; module_class=&#8221;faqstyl&#8221; _builder_version=&#8221;4.13.1&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;center&#8221; header_line_height=&#8221;2.5em&#8221; background_color=&#8221;#dbedc6&#8243; max_width=&#8221;80%&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;30px|25px|30px|25px|true|true&#8221; hover_enabled=&#8221;0&#8243; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<h1>Frequently Asked Questions<span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/span><\/h1>\n<ol><\/ol>\n<h3><strong>1. How is the area of the circular ring determined?<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Ans: <\/strong>Assuming a perfectly concentric circular ring:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Calculate the area of the inner circle by multiplying the radius of the inner circle squared by pi.<\/span><\/p>\n<p>Calculate the area of the outer circle by multiplying the radius of the outer circle squared times pi.<\/p>\n<p>Subtract the area of the inner circle from the area of the outer circle.<\/p>\n<p>You now have the area of the ring itself.<strong><\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3><strong>2. What is the area of a circular ring?<\/strong><\/h3>\n<p><strong>Ans: <\/strong><span class=\"katex-eq\" data-katex-display=\"false\">A=\\pi\\left(R^{2}-r^{2}\\right)<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><strong>3. What is the area of a circular ring?<\/strong><\/h3>\n<p><strong>Ans: <\/strong><span style=\"font-weight: 400;\">Consider there are two concentric circles (circles having the same centre) of different radii. The area in between the circles forms a circular ring<\/span><span style=\"font-weight: 400;\">. It becomes a 2D figure.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Meta Description: We can calculate the sum of the terms in a geometric progression using the formula  S = a(1-r^n)\/(1-r) when r < 1 and  S = a(r^n-1)\/(r-1)when r>1<\/p>\n","protected":false},"author":10,"featured_media":0,"parent":714,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Area of the circular ring - with Examples and FAQs - mydomain<\/title>\n<meta name=\"description\" content=\"Meta Description: We can calculate the sum of the terms in a geometric progression using the formula S = a(1-r^n)\/(1-r) when r &lt; 1 and S = a(r^n-1)\/(r-1)when r&gt;1\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/area-of-the-circular-ring-with-examples-and-faqs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Area of the circular ring - with Examples and FAQs - mydomain\" \/>\n<meta property=\"og:description\" content=\"Meta Description: We can calculate the sum of the terms in a geometric progression using the formula S = a(1-r^n)\/(1-r) when r &lt; 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