By heron"s formula find the area of equilateral triangle whose side is "a" cm.
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s = 1.5 a
area = √ [ s (s-a)(s-a)(s-a) ]
= √[ 1.5a (1.5a-a)^3]
= (1.5a-a)^2√[1.5a * 0.5a]
= (0.5a)^2 √ (0.75 a^2)
= 0.25 a^2 * a^2 √(0.75)
area = √ [ s (s-a)(s-a)(s-a) ]
= √[ 1.5a (1.5a-a)^3]
= (1.5a-a)^2√[1.5a * 0.5a]
= (0.5a)^2 √ (0.75 a^2)
= 0.25 a^2 * a^2 √(0.75)
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