{"id":7324,"date":"2021-12-30T09:54:19","date_gmt":"2021-12-30T09:54:19","guid":{"rendered":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/?page_id=7324"},"modified":"2022-01-03T07:29:58","modified_gmt":"2022-01-03T07:29:58","slug":"concentric-circles-with-examples-and-faqs","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/concentric-circles-with-examples-and-faqs\/","title":{"rendered":"Concentric Circles 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;4.11.3&#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; 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;]<\/p>\n<h1>Concentric Circles 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; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><b>What are Concentric Circles?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The circles that share a common centre but have different radii are known as concentric circles.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/cirfle-300x293.png\" width=\"402\" height=\"393\" alt=\"\" class=\"wp-image-7327 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/cirfle-300x293.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/cirfle-768x751.png 768w, https:\/\/eistudymaterial.s3.amazonaws.com\/cirfle-480x469.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/cirfle.png 797w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/><\/span><\/p>\n<p style=\"text-align: center;\"><em><strong>Concentric Circles<\/strong><\/em><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The figure represents concentric circles with a common centre\u2018 O\u2019.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<h2><b>The region between the two concentric circles<\/b><\/h2>\n<p>\u00a0The region between the two concentric circles is called an annulus, which is a flat ring-like shape.<\/p>\n<p>The area of the annulus can be calculated easily by calculating the difference between the areas of the outer and inner circle.<b><br \/><\/b><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/crer-300x280.png\" width=\"380\" height=\"355\" alt=\"\" class=\"wp-image-7328 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/crer-300x280.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/crer-768x716.png 768w, https:\/\/eistudymaterial.s3.amazonaws.com\/crer-480x448.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/crer.png 846w\" sizes=\"(max-width: 380px) 100vw, 380px\" \/><\/p>\n<p style=\"text-align: center;\"><b><i>Two concentric circles<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The above figure represents a pair of concentric circles, the radius of the outer circle is OC, and the radius of the inner circle is OA. Now the area of the ring: annulus, formed between the two circles can be calculated as follows:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\text { Let } O A=R \\text { and } O C=r<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Area of the circle with Radius <span class=\"katex-eq\" data-katex-display=\"false\">\\mathrm{OA}=\\pi(O A)^{2}=\\pi R^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><br \/>Area of the circle with Radius <span class=\"katex-eq\" data-katex-display=\"false\">O C=\\pi(O C)^{2}=\\pi r^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\"><br \/><span class=\"katex-eq\" data-katex-display=\"false\">\\therefore \\text{The area of the annulus }=\\pi R^{2}-\\pi r^{2}=\\pi\\left(R^{2}-r^{2}\\right) \\mid<\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><b>Some Examples of Concentric Circle<\/b><\/h2>\n<p><b><\/b><\/p>\n<p style=\"text-align: center;\"><b><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-03-300x233.png\" width=\"300\" height=\"233\" alt=\"\" class=\"wp-image-7330 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-03-300x233.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-03.png 316w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-02.png\" width=\"261\" height=\"261\" alt=\"\" class=\"wp-image-7331 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-02.png 261w, https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-02-150x150.png 150w\" sizes=\"(max-width: 261px) 100vw, 261px\" \/> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-01-251x300.png\" width=\"251\" height=\"300\" alt=\"\" class=\"wp-image-7332 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-01-251x300.png 251w, https:\/\/eistudymaterial.s3.amazonaws.com\/CONCENTRIC-CIRCLES-01.png 317w\" sizes=\"(max-width: 251px) 100vw, 251px\" \/><\/b><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">A Ferris wheel, the wheel of a bicycle and a dartboard are some common examples of concentric circles.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><\/span><\/p>\n<p><b>Example<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A playground is surrounded by a ring-like jogging track as shown in the figure. The inner radius of the ground is 8 m and the outer radius of the ground is 13 m. Find the area of the circular jogging track.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-300x137.png\" width=\"423\" height=\"193\" alt=\"\" class=\"wp-image-7333 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-300x137.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-1024x469.png 1024w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-768x352.png 768w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-1080x495.png 1080w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-1280x586.png 1280w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-980x449.png 980w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf-480x220.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/ffhfhf.png 1284w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><\/span><\/p>\n<p><b><\/b><\/p>\n<p><b>Solution<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Given radius of the inner ground is 8 m and the outer radius of the ground is 12 m.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Area of the inner ground\u00a0 <span class=\"katex-eq\" data-katex-display=\"false\">=\\pi(8)^{2}=\\pi \\times 64=64 \\pi \\text{ }\\mathrm{m}^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The total area of the playground <span class=\"katex-eq\" data-katex-display=\"false\">=\\pi(12)^{2}=\\pi \\times 144=144 \\pi \\text{ }\\mathrm{m}^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2234 the area of the jogging track\u00a0 <span class=\"katex-eq\" data-katex-display=\"false\">=\\pi(144-64)=\\pi \\times 80=80 \\pi \\text{ } m^{2}<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400;\">The area of the jogging track is<span class=\"katex-eq\" data-katex-display=\"false\">80 \\pi \\text{ } m^{2}<\/span>.<\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; 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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_text admin_label=&#8221;Related Concepts<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>Related Concepts<\/h1>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.13.1&#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:\/\/mindspark.in\/studymaterial\/math-concepts\/area-and-perimeter-of-a-circle-with-examples-and-faqs\/\" class=\"otherc\">Area and Perimeter of Circle<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/area-of-a-hollow-circle-solved-examples\/\" class=\"otherc\">Area of Hollow Circle<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/area-of-the-circular-ring-with-examples-and-faqs\/\" class=\"otherc\">Area of Circular Ring<\/a><a href=\"#\" class=\"otherc\"><\/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; 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_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; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;]<\/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>Q1. Do concentric circles intersect each other?<br \/><\/strong><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>Ans: <\/strong>Concentric circles do not intersect each other. They share only the centre, other than that they have no points in common.<strong><br \/><\/strong><\/span><span style=\"font-weight: 400;\"><\/span><\/p>\n<h3><strong>Q2. How are concentric and congruent circles different?<br \/><\/strong><\/h3>\n<p><strong>Ans: <\/strong>Two or more circles that share a common centre but different radii are concentric, whereas two or more circles that have equal radii but different centres are congruent.<strong><\/strong><\/p>\n<h3><strong>Q3. 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