Kan somebody heplme #onsangre #on9ine3rey derek wrote the following paragraph proof for the vertical angles theorem: the sum of angle 1 and angle 4 and the sum of angle 3 and angle 4 are each equal to 180 degrees by the definition of supplementary angles. the sum of angle 1 and angle 4 is equal to the sum of angle 3 and angle 4 by the transitive property of equality. angle 1 is equal to angle 3 which phrase completes the proof? by construction using a straightedge by the definition of a perpendicular bisector by the subtraction property of equality by the vertical angles theorem