please do quickly....
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60 degrees (B)
Step-by-step explanation:
since the base is a straight line, it is totally 180 degrees,
to find a you must use linear pair property, which is, if an arm is extending from a straight line, the 2 angles adjacent to it will add up to 180 deg
180-120= 60
hope it helps, pls mark me brainliest
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