In the following figure, if ∠ 1 + ∠ 2 = 100°, then the measure of ∠ 4 is equal to

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In the following figure, if ∠ 1 + ∠ 2 = 100°, then the measure of ∠ 4 is equal to <br><img src=https://i0.wp.com/farm2.staticflickr.com/1909/31547061038_605aebc055_o.jpg?resize=266%2C138&ssl=1" alt=" Lines and Angles">"