Respuesta :

In this case we must apply the properties of supplementary angles and opposite angles.

1 .

opposite angles

∠ 1 = 120 °

supplementary angles

∠ 1 + ∠ 2 = 180

120 + ∠ 2 = 180

∠ 2 = 180 - 120

∠ 2 = 60 °

The same properties can be applied in the other exercises to solve them.

The solution is:

∠ 1 = 120 °

∠ 2 = 60 °

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