Answer :
Given: Side of an equilateral triangle.
To Prove: the area of an equilateral triangle is 
.
Concept Used:
If sides of a triangle are a, b, and c, then area of a triangle is given by:
Where s = semiperimeter of the triangle
Assumption: Let the side of triangle = x cm.
Explanation:
We know that all sides of an equilateral triangle are equal.
Therefore,
Now,
Hence, Proved.
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