Find the perimeter of semicircle with radius 7 cm.

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Find the perimeter of semicircle with radius $7$ cm.

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36

15

20

30

answer is A.

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Detailed Solution

Given that, the radius of semicircle is

7

cm.
We know that, the perimeter of semicircle of radius

r

is,

P = πr + 2 r

.
So, here

r = 7

.
So, the perimeter is,

P = π \times 7 + 2 \times 7

\Rightarrow \frac{22}{7} \times 7 + 14

, substituting the value of

π = \frac{22}{7}

\Rightarrow 22 + 14

\Rightarrow 36

cm
Hence the perimeter of the semicircle is

36

cm.
So, the correct option is 1.

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