How do I find the base of a isosceles triangle from the vertical height and top angle in excel assuming the known angle is at the top the base height is at the bottom and you don't know the slant?

You have an isosceles triangle. The two equal sides are the slanting ones. You know the value of the Angle between them at the top, and you knowthe vertical Height of the triangle.

Length of the base = (2 x Height) x tangent(1/2 of the top Angle) . Length of the equal slanting sides = Height / cosine(1/2 of the top Angle) .

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