Answers

2014-08-26T20:50:02+05:30
Area of equilateral triangle = √3/4*s²
S=2a 
Area = √3/4 *(2a)² 
        =√3/4 *4a²
        = √3a²
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2014-08-27T23:47:57+05:30

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Equilateral triangle: the altitude h can be found as below, as the altitude divides the triangle in to two equal parts. The base is divided into two.

h² = side² - (side/2)² = 3/4 side² = 3 a²

h = √3 a

area = 1/2 (2a) √3 a  = √3 a²

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