Question

If the radius of a circle is 4.2 cm, compute its area and circumference.. ​

Answer 1

Area of a circle = πr2

So, area = π(4.2)2 = 55.44 cm2

Circumference of a circle = 2πr

So, circumference = 2π(4.2) = 26.4 cm

Answer 2

Given: Radius =4.2cm

It is a circle.

To find: Area =?

Circumference=?

$area = \pi {r}^{2}$

$area = \binom{22}{7} {4.2}^{2}$

$area = 55.44 {cm}^{2}$

Circumference=2πr

=2(22/7)(4.2)

=26.4cm