Two parallel lines are cut by a transversal x and a transversal y so that x and y intersect at point Q as shown.
a
k
m
Q
Wong constructs the following argument:
Angle a is missing reason 1] and therefore congruent to one angle in the triangle formed by lines m, x,
and y.
Angles b and care [missing reason 2] and therefore congruent to two other angles in the triangle.
The sum of the three angles in a triangle is 180 degrees. Therefore m Za+mZb+mZc = 180.
What are the missing reasons in Wong's argument?