Question

What is co interior angles?

Answer 1

HI,
Consecutive Interior Angles.When two lines are crossed by another line (called the transversal). The pairs of angles on one side of the transversal but inside the two lines are called Co interior angles. 

Answer 2

Answer:

Co-interior angles lie between two lines and on the same side of a transversal. In each diagram the two marked angles are called co-interior angles. If the two lines are parallel, then co-interior angles add to give 180° and so are supplementary.