Respuesta:
C) 70°
Explicación paso a paso:
∡AOM = ∡MOB
∡AOM = a
∡MOB = a
∡BOC = b
a + a + b + b = 140°
2a + 2b = 140
2 ( a+ b ) = 140
( a + b ) = 140/2
a + b = 70°
∡MOC = a + b = 70°
