Co-interior Angles on Parallel Lines
In this section, we will investigate one final pair of angles formed when two parallel lines are intersected by another line (known as a transversal).
the below applet shows examples of co-interior angles.
Use the above applet to investigate co-interior angles. In your own words, describe what co-interior angles are.
What do co-interior angles add up to?
PART 1
For each diagram below, decide whether the angles marked are co-interior angles or not.
Which of the above diagrams show co-interior angles?
PART 2
Consider the below diagram.
What is the missing marked angle? Justify your answer.