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Answer 1 · 2017-10-02T04:24:00

$10cm$ .

An equilateral triangle is one with all three sides of equal length.

The perimeter of a triangle is the sum of all the three sides.

For an equilateral triangle whose side is $x$ , the perimeter will be:

$P=3x$

Since we know that $P=30$ ,

$30=3x$

Divide both sides by $3$ .

$30/3=(3x)/3$

$(10cancel30)/(1cancel3)=(cancel3x)/cancel3$

$10=x$

Hence, the length of the side of the equilateral triangle is $10cm$ .