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Area of equilateral triangle: 0.5*12*12*sin(60 degrees) = 187 square cm
Area of equilateral triangle: 0.5*7*7*sin(60 degrees) = 21.2 square inches
Area of equilateral triangle: 0.5*8*8*sin(60 degrees) = 27.7 square inches rounded
You can't as there is no hypotenuse in an equilateral triangle. The hypotenuse is the side of a triangle which is opposite a right angle (90°); all angles in an equilateral triangle are 60°.
there are 60 degrees in one of the angles in an equilateral triangle