Question

if the area of a circle is 154cm square find its radius

Answer 1

Answer:

area of a circle :

$\pi \sqrt{r} = 154 \\22 \div 7 \times \sqrt{r} = 154 \\ \sqrt{r = 154 \times 7 \div 22 = 49 = \sqrt{r = 49 \\ r = 7}$

Pi R square is equal to 154

then Pi =22/7

therefore r sq=154*7/22=49

r sq=49

r=7