Educate me... Draw specific arc length at sspecified radius

[williamj]

Lately, I've been doing more and more with curves and arcs. Is there an established, and hopefully simple, method of drawing a specified arc length at a specific radius? I've been beating my head over this for some time now, but, to no avail.

For example, how would I calculated the numbers, to key in, to get a 10" arc length with a radius of 15"?

Any help would be greatly appreciated.

[AlwMVMO]

Arc Length / ( pi * Radius * 2 ) * 360 = Angle of Arc Length

pi * Rad. * 2 = circumference
Arc Len / circumference = % of Arc
% of Arc * 360 = Angle

10 / (3.141593 * 15 * 2) * 360 = 38.197183 degrees

   

If you use the Draw a circular arc using the center option this formula works perfectly on the third question (Enter angle, select second radial point).

The Second question (Enter angle, select first radial point) is your starting point.

[williamj]

Works perfectly!

Thanks, Al. As usual, I am in awe of your supernatural intellectual powers.