Question

The radius of a circle is 2.5 cm. Find the circumference

to

the

nearest

tenth
to the nearest tenth.

Answer 1

15.7 cm²

Explanation:

Given:

`\text{Radius of circle: 2.5 cm}`

Formula:

`\text{Circumference:} \ 2\pi r`

Substitute the radius in the circumference formula:

`\implies \text{Circumference:} \ 2\pi r`

`\implies \text{Circumference:} \ 2\pi (2.5)`

Take π as 3.14 (Approx. value of π):

`\implies \text{Circumference:} \ 2(3.14)(2.5)`

Simplify the circumference:

`\implies \text{Circumference:} \ (3.14)(5)`

`\implies \text{Circumference:} \ 15.7 \ \text{cm}^(2)`

Answer 2

circumference of circle: 2πr ("r" is the radius)

==========

• 2πr

• 2π(2.5)

• 5π

• 15.7 cm