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If you cut the cone in half then drop a line from the point down to the centre of the base, you can then find the radius, which is the the base of one of the triangles you now have. You need to know one of the angles though, then work out the radius through trigonometry.

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Q: How do you find the radius of a cone only knowing slant height?
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Related questions

What is the slant height of a cone with 8 height and 6 radius?

A right circular cone with 8 height and 6 radius has a slant height of 10.


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How do you find the radius and the slant height of a heap of sand in the shape of cone?

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