39. In the figure below, line l is parallel to line m. Transversals t and u intersect at point A on l and intersect m at points C and B, respectively. Point X is on m, the measure of ∠ACX is 130°, and the measure of ∠BAC is 80°. How many of the angles formed by rays of l, m, t, and u have measure 50° ?
Your Answer is
Correct Answer is C
Explanation
It can be seen from the figure that ∠ABC = ∠ACB=50°, then the upper pair of interior angles, the pair of co-positioned angles, and the lower pair of apex angles are all 50°, so choose C