Answer to Question #1194 in Geometry for MrsMaha ismail

Question #1194

1- if I have angle A = angle B and angle D = angle C
Prove that lines AB parallel to line DC.

Expert's answer

A=B and C=D, and A+B+C+D=360
2A + 2 C = 360;
A+C = 180.
The sum of unilateral internal angles equals to 180°, then the lines are parallel.

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