Q. 64.0( 21 Votes )
Surface area of hemisphere = 127(2/7) cm2
1. Surface area of hemisphere = 2×π×r2
⇒ 2×π×r2 = 127(2/7)
⇒ r2 = 20.25
⇒ r = 4.5cm
2. Diameter of sphere = 2×Radius
Diameter = 9cm
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