Find the area of equilateral triangle by heron's formula with side 2x
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s= 2x +2x+2x÷2
6x÷2
3x
area of triangle = √3x (3x-2x) (3x-2x) (3x-2x)
(herons formula) =√3x × X ×X× X
=3x × 3x × 3x × 3x
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