Question

Find the radius of a circle that has an area of 19.625 cm2

Answer 1

The area of a circle is given by the formular:

$A=\pi r^2$

Where A is area in cm squared, pi is 3.14 and r is radius in cm

Given that the area is 19.625 cm^2 then use the values in the equation as;

A= pi * r *r

19.625 = 3.14 * r^2

$19.625=3.14r^2$

Divide both sides by 3.14 as;

$19.625/3.14=r^2$

$6.25=r^2\text{ , r=}\sqrt{6.25\text{ }}$

r=2.5 cm