What is the measure of angle x?
A. 60 degrees
B. 70 degrees
C. 80 degrees
D. 100 degrees

The measure of x in the diagram is (A) 60 degrees
From the figure, both angles are corresponding angles.
So, we have:
x + 20 = 80 --- Corresponding angles are equal
Subtract 20 from both sides
x = 60
Hence, the measure of x in the diagram is (A) 60 degrees
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