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Equation of a Frustum-Shaped Plate

What is/are the equation/s required to calculate dimensions and construction of a frustum shaped plate in its flat form before rolling into cone shape?

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Let a frustum of radii at two ends R1 and R2 (R1 < R2) respectively is to be constructed. Let the half angle of the cone be Q.

Hence, slant height of the end of radius R1,
l1 = ...

Solution Summary

A general equation for a frustum-shaped plate is determined. A diagram of a cone frustum is included.