Question

The radius of a circle is 21 cm, what is the area?​

Answer 1

A ≈ 1385.4 cm²

Explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius )

= π × 21²

= π × 441

= 441π cm²

≈ 1385.4 cm² ( to 1 dec. place )