Question

Pls help me find the area of a circle with a diameter of 42cm. let π= 22/7

Answer 1

1386 cm²

Explanation:

Given : -

Diameter ( d ) = 72 cm

The value of π = 22/7

To find : Area of a circle

We know that,

We know that,the Diameter of the circle = 2 x Radius ( r )

We know that,the Diameter of the circle = 2 x Radius ( r )d = 2r

42 = 2r

r = 42/2

r = 21 cm

r = 21 cmFormula : -

r = 21 cmFormula : -A = πr²

A = (22/7) * 21²

= (22/7) * 21 * 21

= (22 * 21 * 21)/7

= 22 * 21 * 3

A = 1386 cm²

Hence,

the Area of the Circle is 1386 cm².

Answer 2

1,386 cm²

Explanation:

Using the formulas,

A = πr^2

d = 2r

Solving for area,

A = 1/4 πd^2 = 1/4 · π · 42^2 ≈ 1386cm²