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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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Q: How do you get the radius of circle inside the triangle?
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