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If the radii of two concentric circles are $15 cm$ and $13 cm$ , respectively, then the area of the circulating ring in sq. cm will be

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176

178

180

200

answer is A.

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Detailed Solution

It is given to find the area of the circulating ring which is made by two concentric circles are

15 cm

and

13 cm

.
A draft picture has been drawn below.
Question Image

Let

R = 15 cm, r = 13 cm .

Area of the circulating ring

\Rightarrow π (R^{2} - r^{2})

\Rightarrow \frac{22}{7} (15^{2} - 13^{2})

\Rightarrow \frac{22}{7} \times 28 \times 2

( taking

π = \frac{22}{7}

)

\Rightarrow 176 {cm}^{2}

Hence, the area of the circulating ring is 176 sq. cm.
Hence, option 1 is correct.

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