Answer:
Step-by-step explanation:
Since Angle BCD is parallel to EDC, it means they both equal 108 degree. So x = 108
the supplementary angle for 108 is 72 degree, which means Angle c = Angle y, so angle y = 72 degrees.
all angles in a triangle = 360, so use the formula to find out what angle z is
360 = 72 + 72 + z
360 = 144 + z
360 - 144 = z
216 = z
