Answer:
Explanation:
after having found all the opposite angles (congruent/see drawing) we start from line d, which by definition is flat (180°) We find x
180 = 72 + (100 - x)
180 - 72 - 100 = -x
x = -8°
---------------
Line e
12y is the opposite angle of 72°, therefore congruent
12y = 72
y = 72 : 12
y = 6°