22.5 cm
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An equilateral triangle has three sides of the same length. Therefore, the length of each side of an equilateral triangle with a perimeter of 63 metres is equal to 63/3 = 21 metres.
It is: 0.5*4*4*sin(60 degrees) = 7 square cm rounded to nearest integer
It works out as 22.335 feet rounded to three decimal places
Each interior angle of an equilateral triangle measures 60 degrees
is the perimeter of the triangle whose sides measure 7.5 7.1 and 8.1