How to find top radius of Right Truncated Cone?

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Bottom Radius 25mm

Side taper angle 5°

Height 30mm

How to find the Top radius of the the right Right Truncated Cone?

Please help

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The top diameter $d=D-60 \cos 85°$ where $D=25 mm$ is a diameter of the base of the cone. It looks like $d \approx 19.77 mm$.