# Arc/ Arc of a Circle

The arc of a circle is a portion of the circumference of a circle.

The arc of a circle is a portion of the circumference of a circle. Measure an arc by two methods: 1) the measure of the central angle or Central arc in degrees 2) the length of the arc itself or central angle in radians

A practical way to determine the length of an arc in a circle is to plot two lines from the arc’s endpoints to the center of the circle, measure the angle where the two lines meet the center, then solve for L by cross-multiplying the statement:

Central angle in degrees:

measure of angle in degrees/360° = L/circumference.

Length of the arc = 2πR(C/360˚)