Question

if a circle has an area 154cm² then find its radius ​

Answer 1

Answer:

$r = 7$

Step-by-step explanation:

$Area \: of \: circle =154 {cm}^{2} \\ \pi {r}^{2} = 154 \\ \frac{22}{7} \times {r}^{2} = 154 \\ {r}^{2} = 154 \times \frac{7}{22} \\ {r}^{2} = 7\times 7 \\ {r}^{2} = 49 \\ r = \sqrt{49} \\ r = 7cm$

Answer 2

Area of Circle = pi*(r^2)
154=(22/7)*(r^2)
(154*7)/22 = r^2
49 = r^2
r = + or - 7cm


As, r is radius. It can’t be negative.

Therefore, r = 7cm



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