How to find arc length with a 45 degree angle? Diagram Making in Corel Draw By Seekh Raha Hoon.

How to Determine the Length of an Arc

Arc length = (θ/360) of 2πr = (θ/360) × 2πr = rθ × π/180. This formula represents the arc length when the angle is measured in degrees. The length of an arc can be determined using different formulas, depending on the unit used to measure the central angle.

An arc’s length means the same commonsense thing length always means — you know, like the length of a piece of string (with an arc, of course, it’d be a curved piece of string). Make sure you don’t mix up arc length with the measure of an arc which is the degree size of its central angle.
A circle is 360° all the way around; therefore, if you divide an arc’s degree measure by 360°, you find the fraction of the circle’s circumference that the arc makes up. Then, if you multiply the length all the way around the circle (the circle’s circumference) by that fraction, you get the length along the arc. So finally, here’s the formula you’ve been waiting for.

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