Two parallel lines m and n and two secants intersecting at one point C form angles 1, 2, 3 and 4, which are characterized by the condition of the problem.
And the condition says that the degree measure of angles 1 and 2 are equal to each other, it is also known that angle 3 = 120 °.
And we need to find the degree measure of the angle 4.
the lines m and n are parallel, since ∠ 1 = ∠ 2 and cross-lying ∠ 3 = ∠ 4 = 120 °, since they lie with parallel lines m and n and the secant BC.
We can write down the answer.
Answer: 120 ° degree measure of angle 4.
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