{"id":2330,"date":"2021-09-29T08:36:47","date_gmt":"2021-09-29T08:36:47","guid":{"rendered":"http:\/\/stgwebsite.mindspark.in\/wordpress\/?page_id=2330"},"modified":"2021-12-31T11:11:23","modified_gmt":"2021-12-31T11:11:23","slug":"surface-area-of-a-cuboid-derivation-and-examples","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/surface-area-of-a-cuboid-derivation-and-examples\/","title":{"rendered":"SURFACE AREA OF A CUBOID \u2013 DERIVATION AND EXAMPLES"},"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;4.10.6&#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;4.10.8&#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><b>SURFACE AREA OF A CUBOID \u2013 DERIVATION AND EXAMPLES<\/b><\/h1>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.11.3&#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; header_3_text_color=&#8221;#777777&#8243; custom_padding=&#8221;15px|15px||4px|false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><b>SURFACE AREA OF A CUBOID<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">What is a cuboid? It is a three-dimensional shape that has six faces and each one of its faces resembles a rectangle. The cuboid has opposite faces equal to each other. <\/span><b><i>The total surface area of a cuboid is the sum of the areas of all its faces.\u00a0<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">A rectangle has length and breadth but <\/span><b><i>a cuboid has length (l), breadth (b) and height<\/i><\/b> <b><i>(h)<\/i><\/b><span style=\"font-weight: 400;\">as shown in the image below.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x101.png\" width=\"377\" height=\"127\" alt=\"\" class=\"wp-image-3424 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x101.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-480x162.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled.png 606w\" sizes=\"(max-width: 377px) 100vw, 377px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">A two-dimensional shape has an area so the area of the rectangle will be length x breadth. A three-dimensional shape has a surface area which is the sum of the area of all the faces of the cuboid. <\/span><b><i>The total surface area of a cuboid is 2 {(l x b) + (b x h) + (h x l)} where l is length, b is breadth and h is height.<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">For Example: What is the total surface area of a cuboid with the following dimensions?<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x194.png\" width=\"342\" height=\"221\" alt=\"\" class=\"wp-image-3425 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x194.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled.png 437w\" sizes=\"(max-width: 342px) 100vw, 342px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ans: The length is 30 cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0The breadth is 10 cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And the height is 20 cm so\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Total surface area (TSA) of the cuboid = 2 {(l x b) + (b x h) + (h x l)}<\/span><\/p>\n<p><b>TSA of the cuboid = 2 {(30 x 10) + (10 x 20) + (20 x 30)} = 2200 <\/b><span style=\"font-weight: 400;\">cm<\/span><span style=\"font-weight: 400;\"><sup style=\"font-size: 10px;\">2<\/sup><\/span><\/p>\n<p><b><i>The unit of the surface area is written as <\/i><\/b><span style=\"font-weight: 400;\">unit<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">.<\/span><span style=\"font-weight: 400;\"> ( based on whatever is the value of the unit which can be cm, m etc.)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Now, the top and bottom faces in a cuboid can be labelled as below:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x195.png\" width=\"300\" height=\"195\" alt=\"\" class=\"wp-image-3426 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x195.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled.png 410w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">It includes a top and a bottom along with 4 faces. Now, as we saw before, the TSA includes all 6 faces of the cuboid but when we find the lateral surface area (LSA), then we find the area of all the sides excluding the top and the bottom side.\u00a0<\/span><\/p>\n<p><b><i>Lateral Surface area (LSA) of a cuboid is 2h ( l + b) where l is length, b is breadth and h is height.<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">For example: What is the lateral surface area of the cuboid with length = 30 cm, breadth = 20 cm and height = 15 cm?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ans: The LSA of a cuboid = 2h (l + b)\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 2 x 15 (30 + 20)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 2 x 750<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 1500 <\/span><span style=\"font-weight: 400;\">cm<\/span><span style=\"font-weight: 400;\">2<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><b>DERIVATION OF THE SURFACE AREA OF A CUBOID<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The formulas for the TSA and LSA can be easily derived by understanding that there are 6 faces of a cuboid.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x193.png\" width=\"300\" height=\"193\" alt=\"\" class=\"wp-image-3428 alignnone size-medium\" srcset=\"https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-300x193.png 300w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled-480x309.png 480w, https:\/\/eistudymaterial.s3.amazonaws.com\/Utitdersdled.png 560w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Now, The total area is simply the sum of the area of all the sides. We will simply find the area of each side as shown below in the table:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>SIDE<\/b><\/td>\n<td><b>FORMULA for AREA<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>ABCD<\/b><\/td>\n<td><span style=\"font-weight: 400;\">l x b<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>EFGH<\/b><\/td>\n<td><span style=\"font-weight: 400;\">l x b<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>ABFE<\/b><\/td>\n<td><span style=\"font-weight: 400;\">b x h<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>DCGH<\/b><\/td>\n<td><span style=\"font-weight: 400;\">b x h<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>ADHE<\/b><\/td>\n<td><span style=\"font-weight: 400;\">h x l<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>BCGF<\/b><\/td>\n<td><span style=\"font-weight: 400;\">h x l<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Therefore, when we add all the above areas we get\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(l x b) + (l x b) + (b x h) + (b x h) + (h x l) + (h x l) = <\/span><b>2 {(l x b) + (b x h) + (h x l)}<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Similarly, we can derive the formula for LSA. We can subtract the area of the top ( ABCD) and the bottom (EFHG) from the TSA to get the area of the four sides.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, LSA is<\/span><\/p>\n<p><span style=\"font-weight: 400;\">LSA = TSA \u2013 {(l x b) + (l x b)} = 2 {(l x b) + (b x h) + (h x l)} \u2013 2 (l x b)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 2 {(b x h) + (h x l)}<\/span><\/p>\n<p><b>= 2h (l + b)<\/b><\/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=\"http:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#geometry\" class=\"otherc\">Geometry<\/a><\/div>\n<div class=\"trr\"><a href=\"http:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#trigonometry\" class=\"otherc\">Trigonometry<\/a><\/div>\n<div class=\"trr\"><a href=\"http:\/\/stgwebsite.mindspark.in\/wordpress\/math-concepts\/#operations\" class=\"otherc\">Operations<\/a><\/div>\n<div class=\"trr\"><a href=\"http:\/\/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; hover_enabled=&#8221;0&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<\/p>\n<div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/surface-area-and-volume-formulas\/\" class=\"otherc\">Surface Area and Volume Formula<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/csa-of-a-cuboid-formula-examples\/\" class=\"otherc\">CSA of Cuboid<\/a><\/div>\n<div class=\"trr\"><a href=\"https:\/\/mindspark.in\/studymaterial\/math-concepts\/volume-of-a-cuboid\/\" class=\"otherc\">Volume of Cuboid<\/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;4.10.8&#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<\/h1>\n<p><span style=\"font-weight: 400;\"><strong>1.<\/strong> What is the value of <\/span><span style=\"font-weight: 400;\">\u221a8 up to 4 decimal places?<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Ans:<\/strong> The value of root 8 up to 4 decimal places is 2.8284<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>2.<\/strong> Is <\/span><span style=\"font-weight: 400;\">\u221a8 an irrational or rational number?<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Ans:<\/strong> \u221a8 is an irrational number because the value of \u221a8 doesn\u2019t terminate and keeps on extending.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>3.<\/strong> Express root 8 in exponential form.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><strong>Ans:<\/strong> The exponential form of root 8 is (8)<\/span><span style=\"font-weight: 400;\">1\/2<\/span><\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The square root of 64 is 8, and we can calculate this by the prime factorisation method. Let us calculate the value of root 64 to prove it is a rational number. <\/p>\n","protected":false},"author":7,"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>Surface Area of a Cuboid - mydomain<\/title>\n<meta name=\"description\" content=\". 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