Question

The circumference of a circle is $31.4$ units. Find the radius and the area of the circle?($\pi =3.14$)

Answer 1

Circumference $=2\pi r$

$\Rightarrow 31.4=2\times 3.14\times r$

$\Rightarrow r=\frac{31.4}{2\times 3.14}$

$\therefore r=5$ units

Area $=\pi r^2=3.14\times 5\times 5=78.50uni{t}^2$