Question

Find the curved surface and total surface area of a sphere having a radius
21cm.

Answer 1

Given:-Find the curved surface and total surface area of a sphere having a radius 21cm.

Solution:

⇒ Surface Area of Sphere = 4πr²

⇒ Surface Area = 4 × 22/7 × (21)²

⇒ Surface Area = 4 × 22/7 × 21 × 21

⇒ Surface Area = 4 × 22 × 3 × 21

⇒ Surface Area of Sphere = 88 × 63

⇒ Surface Area of Sphere = 5544cm²