In the following figure, if ∠ 1 + ∠ 3 = 120°, then ∠ 2 + ∠ 4 is equal to.

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In the following figure, if ∠ 1 + ∠ 3 = 120°, then ∠ 2 + ∠ 4 is equal to. <br><img src=https://i1.wp.com/farm2.staticflickr.com/1916/43605542190_8eb6c80be8_o.jpg?resize=241%2C164&ssl=1" alt=" Lines and Angles ">"