As shown in the figure, place a pair of triangle plate as shown in the figure, and the degree of ∠ 1 in the figure is______ .

As shown in the figure, place a pair of triangle plate as shown in the figure, and the degree of ∠ 1 in the figure is______ .

As shown in the figure, ∠ 1 = 30 ° + 90 ° = 120 °. So the answer is: 120 °