{"id":8851,"date":"2021-12-05T20:24:20","date_gmt":"2021-12-05T14:54:20","guid":{"rendered":"https:\/\/mathemerize.com\/?p=8851"},"modified":"2021-12-05T21:32:43","modified_gmt":"2021-12-05T16:02:43","slug":"formula-for-surface-area-of-sphere","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/formula-for-surface-area-of-sphere\/","title":{"rendered":"Formula for Surface Area of Sphere with Examples"},"content":{"rendered":"
Here you will learn what is the formula for surface area of sphere and examples based on it.<\/p>\n
Let’s begin –<\/p>\n
A sphere is a three dimensional figure <\/span>(<\/span>solid figure<\/span>), <\/span>which is made up of all points in the space, which lie at a constant distance called the radius, from a fixed point called the centre of the sphere.<\/span><\/p>\n A sphere is like the surface of a ball. The word <\/span>solid sphere <\/span>is used for the solid whose surface is a sphere.<\/span><\/p>\n Surface Area of Sphere = \\(4\\pi r^2\\)<\/p>\n<\/blockquote>\n where r is the radius of sphere.<\/p>\n Example<\/span><\/strong> : Find the surface area of a sphere of radius 7 cm.<\/span> <\/p>\n Solution<\/span><\/strong> : The surface area of the sphere of radius 7 cm would be<\/p>\n Surface Area = \\(4\\pi r^2\\) = \\(4\\times {22\\over 7} \\times 7 \\times 7\\) = 616 \\(cm^2\\)<\/p>\n Example<\/span><\/strong> : A cylinder, whose height is two-thirds of its diameter, has the same volume as a sphere of radius 4 cm. Calculate the radius of the base of the cylinder.<\/p>\n Solution<\/span><\/strong> : Let radius of cylinder = r.<\/p>\n Diameter of cylinder = 2r<\/p>\n Height of cylinder = \\(2\\over 3\\) (2r) = \\(4r\\over 3\\)<\/p>\n Volume of cylinder = \\(\\pi r^2 h\\) = \\(\\pi r^2 {(4r\\over 3)}\\) = \\(4\\pi r^3\\over 3\\)<\/p>\n Volume of the sphere with radius 4 cm = \\(4\\over 3\\) \\(\\pi (4)^3\\) = \\(4\\over 3\\) \\(\\pi (64)\\)<\/p>\n According to the question,<\/p>\n Volume of the cylinder = Volume of sphere<\/p>\n \\(\\implies\\) \\(4\\over 3\\) \\(\\pi r^3\\) = \\(4\\over 3\\) \\(\\pi (4)^3\\)<\/p>\n \\(\\implies\\) \\(r^3\\) = \\((4)^3\\) \\(\\implies\\) r = 4 cm<\/p>\n Hence, radius of base of cylinder = 4 cm<\/p>\n\n\nFormula for Surface Area of Sphere<\/h2>\n
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