Question

22
(a) The area of circle is 1386 cm? Find its radius. (Take n as = ) [2]
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Answer 1

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Q) The area of a circle is 1386 cm² . Find it's radius. Take π = $\dfrac{22}{7}$ .

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In this question, we would simply use the formula for finding the area of a circle. We would put the values of the given terms and would easily find the radius.

Let the radius of the circle be “r” .

We know ,

• Area of the circle = 1386 cm² .

Using the formula for finding the area of a circle..

$\star \: \: \boxed{ \rm{area _{circle} = \pi \: {r}^{2} }}$

Put the values..

$\mapsto \sf\: 1386 \: {cm}^{2} = \frac{ \cancel{22}}{7} \times {r}^{2} \\ \\ \sf \mapsto \: 63 \: {cm}^{2} \times 7 = {r}^{2} \\ \\ \sf \mapsto \: 441 \: {cm}^{2} = {r}^{2} \\ \\ \mapsto \sf \: r = \sqrt{441 \: {cm}^{2} } \\ \\ \colon \implies \underline{ \boxed{ \rm{r = \bf{ \pink{ 21 \: cm}}}}}$

So,

The radius of the circle would be 21 cm.

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★ More about Circle :

♪ A circle is a round shaped figure, which has no corners or edges . It is two dimensional closed curve.

♪ Area = πr²

♪ Circumference = 2πr

♪ Diameter = 2×r

♪ Number of vertices = 0

♪ Number of edges = 0

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Answer 2

Answer:

isu r answer hope it helps u