If the surface area of a sphere is 616 cm2, its diameter (in cm) is
Given: surface area of a sphere is 616 cm2
Surface area of the sphere is: 4 × π × r2 (where r is radius of sphere)
∴ 4 × π × r2 = 616 cm2
r2 = 
= 
= 49
r = √49 = 7 cm
∴ Diameter = 2 × r = 2 × 7 = 14cm
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