Question

Find the radius of the circle whose Area is 154. Use
$\pi = \: \frac{22}{7}$


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Answer 1

Answer:

Radius of the circle is 7 cm.

Step-by-step explanation:

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

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Answer 2

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Find the radius of the circle whose area is 154cm^2. Use $\pi = \displaystyle{\frac{22}{7}}$

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$Area \: of \: circle = 154 \:sq.\: units$

$\pi r^2 = 154$

$r^2 = \displaystyle{\frac{154}{\pi}}$

$r^2= \displaystyle{\frac{154}{22}} × 7$

$r^2=49$

$r=7 units$

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