Find the area of an equilateral triangle whose perimeter is 120 cm.
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To find this area, you first need to find the height of the triangle.
The formula would be 20^2 + B^2 = 40^2, or 400 + B^2= 1600, B^2=1200.
The square root of 1200 is 34.64.
The formula for a triangle is half the base times the height. The base is forty, one-third of the perimeter 120. Half of forty is twenty. To find the area, multiply 34.64 and 20.
The area is approximately 692.82 cm, or 6928.2 mm.
Hope this helps…
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