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Old Nov 21, 2012, 04:34 PM
small_rcer is offline
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Canada, NS, Halifax
Joined Dec 2005
283 Posts
Simple method

Put a straight edge vertical against the leading edge. Where it touches the leading edge is very close to the centre of the radius. In reality the centre will be just a bit higher.

You want this straight edge to be perpendicular to a line from the contact point to the centre of the trailing edge. This contact point is the centre of the leading edge.

How high is it above the straight edge along the bottom?

What is the chord?

I will use my calculator to find the AofA

Jim H
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