Useful Calculators

Find the radii of two parallel arcs, given the length of each arc and the distance between them.

The Math:

• [Radius of Smaller Arc] = [Arc Length 1] x ([Distance Between Arcs] / ([Arc Length 2] – [Arc Length 1])
• [Radius of Larger Arc] = [Radius of Smaller Arc] + [Distance Between Arcs]

The Purpose:

This calculation is useful for things like drafting conical hat sections, skirt panels, etc.