# Answer to Question #259 in Trigonometry for Nick Humphries

Question #259

A cone has a slant side measure (m) and a semi-vertical angle 2(x). Prove that the measure r of the radius of the sphere inscribed in the cone is given by:

r = (m sin(4x))/2(1+sin(2x))

r = (m sin(4x))/2(1+sin(2x))

Expert's answer

You have to draw a picture and look at the triangles. Then, write down the sin/cos of the angle at the vertex of the different triangles.

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