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Because the Hypotinuse is the sum of the square of the other two sides. The sum of the square of the base plus the square of the height equals the slope.
Its Square BasedPyramid
Your roof is a square based pyramid.
pyramid (pir' a mid) A massive structure built of stone,usually having a square base and four triangular sides that slope upward.
There are quite a few ways you could find the height of a square pyramid. You could measure the sides for example.