Question

The circumstance of a circle is 31.4 find radius and area of circle

Answer 1

I hope it will help you

Answer 2

Circumstances =2
$circmstances = 2\pi {r}^{2} \\ 31.4 = 2 \times 3.14 \times {r}^{2} \\ 31.4 \div 3.14 = 2 \times {r}^{2} \\ 3140 \div 314 = 2 \times {r }^{2} \\ 10 = 2 \times {r}^{2} \\ 10 \div 2 = {r}^{2} \\ 5 = {r}^{2} \\ r = \sqrt{5 }$
area of circle=
$\pi {r}^{2} \\ 3.14 \times \sqrt{5 } \times \sqrt{5 } \\ 3.14 \times 5 \\ 15.70 \\ 15.7$