It can be found out through applying Sine/Cosine/tan to the angles of for example a shadow of a building due to sun.
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Why do you need to FIND the slant height if you have the [lateral height and] slant height?
56 feet.
we can find the height of a rectangular pyramids located at the top of the base
You find the height by using Pythagoras' theorem and then 0.5*base*height = area.
When the sun is low down, the shadow is longer. If the sun is high up the shadow is shorter.