∠ACB is 58°. What is the measure of ∠ABC ? Enter your answer in the box. m∠ABC = ° Circle B with a tangent, a chord, and a line segment. Point A is at 12 o clock on the circle. Point C is at 1 o clock outside of the circle. Segment A B and segment B C meet at point B in the center. Tangent A C passes through point C.