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Circular Arch Radius Formulas

      A little basic math, plus some links to on-line calculators for figuring arch radius numbers. January 19, 2011

Question
Does anyone know of a method for figuring a radius with the span and rise? Example: 24"span with a 9/16"rise.

Forum Responses
(Cabinetmaking Forum)
From contributor R:
Draw it on Delta Cad and then Dim it.


Click here for higher quality, full size image



From contributor K:
Radius = length squared + (4X height squared) divided by (8 X height).



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