In the diagram, line m is parallel to line n.

What is the measure, in degrees, of angle ABC?

m∠ABC = 55°

Step-by-step explanation:

m∠BAC = 50° because ∡BAC ≅ ∡DCA

since there are 180° in ΔABC the m∠ABC = 180-(75+50) which equals 55°

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right