a the given figure, BC || AD. Find the measures of x, y and z
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360° = x + y + y + a
First let's find y
180° = 120° + y
y = 180 - 120
y = 20°
Now let's find x
x = 120° ( because of corresponding angles )
360° = x + y + y + z
= 20° + 20 + 120 + z
= 160 + z
360 - 160 = z
200 = z
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