Question

find surface area of a sphere whose radius = 10.5 cm​

Answer 1

this is correct answer..

Answer 2

Answer :-

• Surface Area of Sphere = 1386 sq.cm.

Explanation :-

Given : Radius of sphere = 10.5 cm.

To Find : Surface area of sphere.

Solution :

We know that,

Surface Area of Sphere = 4πr²

Substitute the values :

➞ Surface Area of Sphere = 4 × 22/7 × (10.5)²

➞ Surface Area of Sphere = 88 × 15 × 105/100.

➞ Surface Area of Sphere = 138600/100.

➞ Surface Area of Sphere = 1386 sq.cm.

Therefore,

• Surface Area of Sphere = 1386 sq.cm.

Extra Information :-

• T.S.A. of Sphere = 4πr²

• L.S.A. of Sphere = 4πr²

• Volume of Cube = 4/3 πr²

• T.S.A. of Cone = πr(r + l).

• Volume of Cone = 1/3 πr²h.

• L.S.A. of Cone = πrl.