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| 1. |
Internal diameter of a hemispherical cup is 7 cm . Find its inner surface area. |
| Answer» Diameter = 7 cm. Therefore, Radius = 7/2 cm.// Thus, inner surface area of a cup = CSA = 2πr^2 = 2 * 22/7 * 7/2 * 7/2 = 77 cm^2// | |