In circle d, angle adc measures (7x + 2)°. arc ac measures (8x - 8)°. circle d is shown. points a, b, and c are on the circle. point c is on the opposite side of points a and c. lines are drawn from point a to point b, from point b to point c, from point c to point d, and from point d to point a. angle a d c measures (7 x + 2) degrees. arc a c measures (8 x minus 8) degrees. what is the measure of angle a b c ? 36° 43° 72° 144°