Answer:
123°
Explanation:
Subtract the measures of the given interior angles from 180 to find the measure of the missing interior angle
180 - 60 - 63 = 57°
Subtract 57 from 180 to find the measure of the external angle/angle 1.
180 - 57 = 123°
Answer: 123
60+63=123
180-123=57
180-57=123
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