Answer:
A
Explanation:
To find x:
All of a triangles sides are equal to 180°.
60+40=100
180-100=80
x=80°
To find y:
All angles on the same side of a line equal to 180°.
180-40=140
y=140°
To find z:
20+140=160
180-160= 20
z= 20°
D, because 180-60-40=100
All triangle's add up to 180
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