Co Interior Angles

A co interior angle is formed when two lines are intersected by a third line in two distinct points.

Co interior angles. In geometry an angle of a polygon is formed by two sides of the polygon that share an endpoint. See the below diagram which is showing what are co interior angles. Co interior angles lie between two lines and on the same side of a transversal.

If the two lines are parallel then co interior angles add to give 180 o and so are supplementary. For a simple non self intersecting polygon regardless of whether it is convex or non convex this angle is called an interior angle or internal angle if a point within the angle is in the interior of the polygon. In the diagram below the angles cgf and afg are supplementary.

The four angles that lie on the inside of the two lines are called interior angles. Either right hand side or left hand side of transversal are called co interior angles. Angles basics 3 comparing angles to right angles 4 estimate measure and compare angles using degrees 5 angles on a straight line 6 angles on a point 6 vertically opposite angles 6 classifying triangles and describing quadrilaterals 7 angle sum of a triangle 7 parallel lines 7 corresponding alternate and co interior.

First we will learn the definition of co interior angles. How to use the consecutive interior angles theorem. The consecutive interior angles theorem states that if two parallel lines are cut by a transversal then each pair of alternate interior angles is congruent.

The following figures give the some examples of co interior angles.