The length of an arc depends on the radius of a circle and the central angle th. The formula to. You can use a formula for either degrees or radians for finding arc length.
From this point on we are going to use the.
Therefore if you divide an arcs degree measure by 360 you find the fraction of the circles circumference that the arc makes up. Rounded to 3 significant figures the arc length is 628cm. Once you got the hang of radians we can use the arc measure formula which requires the arc length s s and the radius of the circle r r to calculate. A circle is 360 all the way around.