prove that the area of an equilateral triangle of side "a" units is √3/4 a2 units
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area of a triangle with 2 adjacent sides and in between angle Φ is
1/2 * a*b* sinΦ
here a=b=c and Φ =60
so 1/2 *a*a* sin60
√3/4* a^2
1/2 * a*b* sinΦ
here a=b=c and Φ =60
so 1/2 *a*a* sin60
√3/4* a^2
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