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A water sprinkler in a lawn sprays water as far as $7 m$ in all directions. Find the length of the outer edge of wet grass.

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40 m

44 m

48 m

51 m

answer is B.

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Detailed Solution

Given a water sprinkler in a lawn sprays water as far as 7 m in all directions.
As we know that, the length of outer edge of wet grass will be the circumference of the circle.
The circumference of the circle is,

C = 2 π r

⇒ C = 2 × π × 7

⇒ C = 2 × 227 × 7

⇒ C = 44 m

Therefore, the length of outer edge of wet grass is 44 m.
Hence, option 2 is correct.

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