Alternate Interior Angles Vs Alternate Exterior Angles. On parallel lines co-interior or C angles add up to 180. Geometry - Identifying Alternate Interior and Exterior Angles - YouTube.
Alternate Exterior Angles are a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal. Angles that are in the area between the parallel lines like angle 2 and 8 above are called interior angles whereas the angles that are on the outside of the two parallel lines like 1 and 6 are called exterior angles. Conversely if two lines are parallel any pair of alternate exterior angles.
Just as with exterior angles we can have consecutive interior angles and alternate interior angles.
Just as with exterior angles we can have consecutive interior angles and alternate interior angles. In this example these are two pairs of Alternate Exterior Angles. Angles that are in the area between the parallel lines like angle 2 and 8 above are called interior angles whereas the angles that are on the outside of the two parallel lines like 1 and 6 are called exterior angles. If lines are parallel then same side interior angles are supplementary and same side exterior angles are supplementary.