Co interior angles: Learn what consecutive interior

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. Learn what consecutive interior angles are and how they are formed by two lines crossed by a transversal. Find out how to identify them and why they add up to 180° when the lines are parallel. 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. 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 ...