The figure below shows a triangle with vertices a and b on a circle and vertex c outside it. side ac is tangent to the circle. side bc is a secant intersecting the circle at point x. the figure shows a circle with points a and b on it and point c outside it. side bc of triangle abc intersects the circle at point x. a tangent to the circle at point a is drawn from point c. arc ab measures 176 degrees and angle cba measures 56 degrees. what is the measure of angle acb? a. 32° b. 60° c. 28° d.16°