Problem one finds the radius given radians and the second problem uses degrees. The formula to measure the length of the arc is. The circumference of a circle is the total length.
Radius of circle and is denoted by r symbol.
The formula to measure the length of the arc is. The arc length is frac 1 4 of the full circumference. You need to know the length of the radius to use this method. Now arc length is given by th360 2 P r l th360 2 227 45 275.