That the area of a triangle = 0.5*base*height
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Area of a triangle = base * height / 2 Therefore the base = Area * 2 / height
Area of Triangle = 1/2 base x height 28 = 4 x height height = 7 cms
The Formula is Base*Height, or 1/2 Height (altitude of the triangle) * Base (of the Triangle) * height (Height of the prism)
That will depend on the height of the triangle which has not been given. Base = (84*2)/height
Area=1/2(base*height) where either side can be the base or the height in a right triangle.