Answer:
A E F
Explanation:
Rules to know:
Triangles = 180 degrees
Straight lines = 180 degrees (example z + w = 180)
Therefore: angles of straight line = angles of triangle
A : w is an obtuse angle (greater than 90) and x is acute (less than 90)
E : w is obtuse whereas y is acute.
F : Since triangle = 180 = x + y + z
Straight line = 180 = z + w
Equate the two:
z + w = x + y + z (subtract z from both sides)
w = x + y
