# 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.

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.

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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