Given a circle with center O, the arcs AB and CD must be congruent.
Check the final answer first, then review the worked steps.
Check the final answer first, then review the worked steps.
The measure of arc AB is equal to the measure of its central angle, which is 90 degrees. The measure of arc CD is equal to the measure of its central angle, which is 50 degrees. Since 90 degrees is not equal to 50 degrees, the arcs are not congruent.