Question

Find the radius, and the approximate circumference and area of the circle below. (Use 3 for \pi)

Answer 1

(Pi value = 3)

Given diameter of circle = 12 inches

Radius of circle :

$= \tt\frac{diameter}{2}$

$= \tt\frac{12}{2}$

$= \tt6 \: inches$

Thus, the radius of this circle = 6 inches

Circumference of this circle :

$= \tt2\pi r$

$=\tt 2 \times 3 \times 6$

$= \tt36 \: inches$

Thus, the circumference of this circle = 36 inches

The area of this circle :

$= \tt\pi {r}^{2}$

$=\tt 3 \times 6 \times 6$

$= \tt108 \: {inches}^{2}$

Thus, the area of this circle = 108 inches²

Therefore,

Radius = 6 inches

Diameter = 12 inches

Circumference = 36 inches

Area = 108 inches²