Respuesta:
a) β = 75° b) β = 107° c) β = 51° d) β = 135°
Explicación paso a paso:
a) ∝ + β = 140
65 + β = 140
β = 140 - 65
β = 75
b) β + ∝ = 180
β + 73 = 180
β = 180 - 73
β = 107
c) β + ∝ = 90
β + 39 = 90
β = 90 - 39
β = 51
d) β + ∝ = 180
β + 45 = 180
β = 180 - 45
β = 135
