You don't need to find it. From what your question states the area is already given to you.
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Divide the area by height then you get the base.
area of a triangle = 1/2 base x height ie times the area by two then divide by the base = height
The height has not been given but the area of the triangle is: 0.5*height*base
Of a square? (area/height=base) Of a triangle? ({area/height}/2=base) Or of some other shape?
If the shape in question is a triangle, then Area = 0.5 * Base * Height So Height = 2 * Area / Base