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    Question

    type-sssc

    A hollow spherical metallic ball has an external

    diameter 12cm and is 3/2cm thick. Find the surface area of the ball (in cm2) is.
    A 254.3 Correct Answer Incorrect Answer
    B 1154.53 Correct Answer Incorrect Answer
    C 1596.47 Correct Answer Incorrect Answer
    D 1569.8 Correct Answer Incorrect Answer

    Solution

    Given- Diameter = 12cm R = 6cm, r = 6-3/2=9/2 cm Surface area of the ball = 4 π [R3-r3] = 4 ×22/7 [216-729/8] = 88/7 [(1728-729)/8] = (88/7) ×999/8 = (11×999)/7= 1569.8cm2

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