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The perimeter of a regular pentagon is $100$ cm. How long is each side?

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26

25

20

22

answer is C.

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Detailed Solution

It is given that the perimeter of a regular pentagon is 10 cm.
In a regular pentagon, all five sides are equal.
So, the formula for the perimeter of a regular pentagon is

Perimeter = 5×side

Therefore,

5×side=100 s i d e = 1005 ⇒ 20 c m

Hence, the side of a regular pentagon is

20

cm.
Hence option (3) is correct.

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