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Find the area of a circle whose radius is $7 km$ .

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154 k m 2

134 k m 2

164 k m 2

124 k m 2

answer is A.

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Detailed Solution

Given a circle having radius 7 km.
The area of a circle is,

A = π r 2

Substituting the value of r in above equation,

⇒ A = 227 × 7 × 7

⇒ A = 22 × 7

⇒ A = 154

Therefore, the area of the circle is

154 k m 2

.
Hence, option 1 is correct.

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