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Vertical Angles Theorem: When two lines cross or intersect, the angles that are mirrored are the same measure.The two intersecting line segments form four angles and the sum of two angles that form a straight line is 180° because of the definition of supplementary angles. Angle 1 + Angle 2 = 180°. Angles 2 and 3 also form a straight line, by definition of supplementary angles Angle 3 + Angle 4 = 180°. The sum of angles 1 and 2 are 180° and the sum of angles 3 and 4 is 180°, these would be equal to each other because of the Transitive property of Equality, Angles 1 and 2 is equal to the sum of angles 3 and 4. Next we would use the Subtraction Property of Equality angle 4 can be subtracted from both sides of the equation to prove that angle 1 and 3 are equal.