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We all know that an equilateral triangle has each angle of 60 degree.
when we apply the formula Sin 60 degree *side*side,we can easily find the answer.
so Sin60 degree *6*6= sq. root3/4*6*6
=1.73/4*36 {as Sq. root 3=1.73}
=15.57 square cm
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Area of equilateral triangle is 3^1/2/4 * side^2. So, by solving w get area = 9.3^1/2