Hi

The length of a side in an equilateral triangle is 5 inches. 

Find the area of the triangle.

A = (1/2)b*h  where h =  using the Pythagorean Theorem

     A = (1/2)* 5in * = 10.8253in^2



Checking our answer using the Heron's Equation:

 where a,b,c are the lengths of the sides and s is the semi-perimeter

 = 10.8253in^2



 

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