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  1. The surface area of a sphere is 64π cm2. Its diameter is equal to
    1. 16 cm
    2. 8 cm
    3. 4 cm
    4. 2 cm
Correct Option: B

4πr² = 64π sq.cm.
⇒ r² = 16
⇒ r = 4 cm
∴ Diameter = 8 cm


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