Triangles with equal sides are congruent. Then, since AO = CO and BO = DO and chord CD = chord AB, then triangle AOB = triangle COD. Thus, angle AOB = angle COD = 77 = x .
Triangles with equal sides are congruent. Then, since AO = CO and BO = DO and chord CD = chord AB, then triangle AOB = triangle COD. Thus, angle AOB = angle COD = 77 = x .
+279 
Find the value of x. If necessary, round your answer to the nearest tenth. O is the center of the circle. The figure is not drawn to scale
