Question

A circle has a radius of 21cm. find its circumference and area. (use=22/7)​

Answer 1

Answer:

$circumference \: of \: circle \: = 2\pi \: r \\ = 2 \times \frac{22}{7} \times 21 = 3 \times 44 \\ = 132c {m}^{2}$

$area \: of \: circle \: = \pi {r}^{2} \\ = \frac{22}{7} \times 21 \times 21 = 1386c {m}^{2}$