You must know what type of geometric shape it is. However, if it is a rectangle (and you know the width), then then the formula is Area/Width=height. Edit your question if it is a different shape.
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Area = Base * Height so Base = Area/Height
Divide the area by the height
Area = 0.5*Base*Height
You find the height by using Pythagoras' theorem and then 0.5*base*height = area.
Area = 1/2 * base * height.