Question

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

Answer 1

Answer:

15.7 cm²

Step-by-step 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