The diagram shows a circle divided into 4 congruent sectors. Each sector has radius r, central angle measured in radians, and arc len S e T S S There are 2 radians i • Substituting 40 into the equation results in Using the d W Move expressions to the lines to show that the arc length is equal to the radius multiplied by the central angle. The circumference of the circle is represented by the equation C = 2tr. Because the circle is divided into 4 congruent sectors, the eq can be written as Using the transitive property of equality results in the equation S 0 40 C = 2лг C=4S 45 = 2xr 45-40 S-Or C= circle, and based on the diagram this is equal to property of equality.​