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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 58,306
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That's a really good question. Interesting.
Google says
To find the radius (R) of a circle using an arc, the most practical method involves measuring the chord length (W, the distance between the arc's endpoints) and the sagitta (H, the height at the midpoint of the arc). The formula is R=W/2+W^2/8*H
So 80.25/2 + 80.25^2 / 8*2.125 = 418.95"
__________________
Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa  SOLD 2004 - gone but not forgotten
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