Question

if area of a circle is 616 sq.cm find radius,circumference and diameter ​

Answer 1

Answer:

area of circle =

$\pi {r}^{2} \\ 616 = \frac{22}{7} \times {r}^{2} \\ \frac{616 \times 7}{22} = {r}^{2} \\ 196 = {r}^{2} \\ r = 14$

d = r×2 = 14 × 2 = 28cm

circumference =

$2\pi \: r \: \: = 28 \times \frac{22}{7} \\ = 88cm$