find the value of each variable. for the circle, the dot represents the center.\na = (simplify your answer.)

find the value of each variable. for the circle, the dot represents the center.\na = (simplify your answer.)
Answer
Explanation:
Step1: Recall property of cyclic quadrilateral
The sum of opposite angles in a cyclic quadrilateral is 180°.
Step2: Find angle (a)
Angle (a) and the 103° - angle are opposite angles in the cyclic quadrilateral. So (a + 103^{\circ}=180^{\circ}). Then (a=180^{\circ}- 103^{\circ}).
Answer:
(77^{\circ})