If the perimeter of an equilateral triangle is $30 c m$ Find the side .

10 c m

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15 c m

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12 c m

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None.

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Solution

The correct option is A $10 c m$
Let the side of equilateral triangle be $a$
The perimeter of equilateral triangle $= 3 a = 30 c m$
The side of equilateral triangle $=$ $\frac{30}{3} = 10 c m$

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