Respuesta :

Answer: 123

Step-by-step explanation:

60+63=123

180-123=57

180-57=123

Answer:

123°

Step-by-step 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°

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