Respuesta:
D) 80°
Explicación paso a paso:
70 + (180 - ( 90 + x ) ) = 80
180 - ( 90 + x ) = 10
180 - 90 - x = 10
90 - x = 10
x = 80°
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Verified answer
Respuesta:
D) 80°
Explicación paso a paso:
70 + (180 - ( 90 + x ) ) = 80
180 - ( 90 + x ) = 10
180 - 90 - x = 10
90 - x = 10
x = 80°