Question

8.
LUME
The radius of a sphere is 21cm. What is the surface area of the
sphere?​

Answer 1

Given :-

• Shape = Sphere
• Radius of the Sphere = 21cm

To Find :-

• Surface Area of the Sphere.

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

________________

Formulas Related to Sphere :

• Volume of sphere = 4/3πr³
• Surface area of sphere = 4πr²

________________