Question

From the figure given below, extract the proof the sum of three interior angles of
triangle is 180'. It is given that V/m.
(Hint: Use properties of parallel lines, angles on a straight line)​

Answer 1

Step-by-step explanation:

since l || m

therefore PAB=ABC(alternate interior angle)

similarly, QAC=ACB

since PAB+BAC+QAC=180°(straight line)

ABC+BAC+ACB=180°

hence proved