Jamal’s teacher gave him the following figure and asked him to provide a statement that would guarantee lines a and b are parallel.

Which statement should Jamal use to prove that lines a and b are parallel?

∠7 = 120°

∠2 = 60°

∠4 = 60°

∠3 = 120°

Question

Jamal’s teacher gave him the following figure and asked him to provide a statement that would guarantee lines a and b are parallel.

Which statement should Jamal use to prove that lines a and b are parallel?

 ∠7 = 120°

 ∠2 = 60°

 ∠4 = 60°

 ∠3 = 120°

anonymous · Answer

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anonymous · Answer

http://www.mathsisfun.com/geometry/parallel-lines.html Basically, figure out all of the angles assuming the two lines are parallel using the theorems above. Then you'll see that only one of the above multiple choices line up.