There are lots of theorems related to triangles. Read any geometry school book, and you'll probably find several. Here I will mention but one: The sum of the angles of a triangle is always 180 degrees.
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Pythagoras' theorem
When a triangle is not a right triangle
pythagrem therom a squred + b squared =c squared
the tangent of an angle is opposite over adjacent side of triangle
Use pythagoras' therom: 82-52 = 39 and the square root of this is 6.244997998 height = 6.245 ft to 3 d.p.