For an equilateral triangle where the width of each side is given as w and each angle is 60 degrees:
r = SquareRoot(w^2 - 0.25w^2)
For an isosceles triangle with two angles a and a side between them of length b.
r = 0.5 * b * tan(0.5 * a)
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When you draw a circle in math, and you draw a triangle inside of it, 2 of the lines should be the radius of the circle, and the third (bottom) line that is not the radius is the chord.
It has at least two radii, the radius of the circle going through the vertices and the radius of the inscribed circle touching all the sides.
radius
True
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