Question

Find the area and circumference of the following.
(a) A circle of radius 7 cm Take π = 22/7

Answer 1

A = 154 cm² , C = 44 cm

Explanation:

the area (A) of a circle is calculated as

A = πr² ( r is the radius )

given r = 7 , then

A =
`(22)/(7)` × 7²

=
`(22)/(7)` × 49

= 22 × 7

= 154 cm²

the circumference (C) of a circle is calculated as

C = 2πr

= 2 ×
`(22)/(7)` × 7

= 2 × 22

= 44 cm