Question

Surface area of a sphere Is 784pi then find the radius

Answer 1

7.90pi

• CSA of a sphere =two pie r square
• 784=4×3.14×(r)2
• 784=12.56×(r)2
• 784/12.56=(r)2
• 62.42=(r)2
• root 62.42=r
• r=7.90pi