Parallel Lines + Transversal

Free interactive math game: Parallel Lines + Transversal — Corresponding, alternate.... Part of the Geometry (Angles) category on MathKite.

Example problems

Taken from the generator that powers this exercise. A fresh set appears every time the page is opened, and the printable worksheet holds ten of them.

  1. Two parallel lines are cut by a transversal. One angle is 150°. Find the co-interior angle.
  2. Two parallel lines are cut by a transversal. One angle is 130°. Find the vertical angle.
  3. Two parallel lines are cut by a transversal. One angle is 60°. Find the co-interior angle.
  4. Two parallel lines are cut by a transversal. One angle is 120°. Find the vertical angle.

About this exercise

Angles formed when a line crosses two parallel lines.

How to solve it

Corresponding and alternate angles are equal, while co-interior angles add to 180.

Worked example

If one angle is 70, the alternate angle across the transversal is also 70.

Common mistake

Assuming every angle is equal. Half of them are the supplement instead.