solve for the radius of an arc.

Thread Starter


Joined Oct 28, 2005
I'd like to know the formula for finding the radius of an arc if you know the width of a segment of an arc, and the height of the segment, but you can't measure the whole circle.
I can't figure out how to reduce the pixel size of a bitmap without freezing the computer, otherwise I'd send a diagram.


Joined Jan 18, 2005
Hi there, in order to determine the radius or length of an arc we use the formula. S = r θ, where s is the length of the arc, r is the length of the radius and θ is the angle the radius makes with the arc, in radians , so if you are using degrees then convert it in to radians.
Hope That Helps