Let us better understand co-interior angles through a diagram. In the diagram, the pair of angles which are marked are co-interior angles. Note: There is a unique property for the co-interior angles. If there are two parallel lines and one line intersecting them called transversal, then the sum of interior angles will be 180 ∘ or are ... Properties Theorems and Proofs Antithesis of the Theorem Co-interior Angles Co-interior Angle Theorem and Proof Solved Examples FAQs Alternate Interior Angles Definition The angles which are formed inside the two parallel lines, when intersected by a transversal, are equal to its alternate pairs. These angles are called alternate interior angles. Consecutive interior angles are a pair of angles that are located on the same side of the transversal and are in between the two lines it intersects. They are also commonly known as co-interior angles or same-side interior angles. For two angles to be considered consecutive interior angles, they must: Lie in the interior region (between the two lines). Be on the same side of the transversal line. Have different vertices. Learn what consecutive interior angles are and how they are related to parallel lines and transversals. Find out the properties, theorem, proof, and examples of consecutive interior angles.
