Angles A and B are known as adjacent angles, which always sum to 180 degrees.
Therefore, angle A plus angle B = 180
We also know that angle B = 2 * angle A so we can say that
angle A + 2 * angle A = 180
3 * angle A = 180
Therefore, angle A = 60 degrees (and angle B = 120 degrees)
Source:
http://www.1728.org/quadpar.htm
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Answer:
I believe the second option.
Step-by-step explanation:
