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Surface area of a wooden sphere is 40 cm2. It is cut into two identical hemispheres. Find a. The area of the plane surface of one of the hemispheres, b. Its surface area. |
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Answer» a. Surface area of the sphere = 4 πr2 Here, 4 πr2 = 40cm2 πr2 = 10cm2 ∴ Area of plane surface = πr² = 10cm2 b. Surface area of one piece (hemisphere) = 3 πr2 = 3 x 10 = 30cm2 |
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