Alternate Interior Angles And Alternate Exterior Angles. 1 and 4 is one pair of alternate exterior angles and the other pair is 2 and 3. Equal Alternate Interior Angles.
Exterior Angles Transversal Line. If lines are parralel then corresponding angles are congruent and alternate exterior angles are congruent. If alternate exterior angles are congruent then the lines are parallel.
The alternate exterior angles are the opposing pair of exterior angles formed by the transversal and the two lines.
On parallel lines alternate or Z angles are equal. Look at the blue lines demonstrating the shape - the Z may be back to front as in the second example but the principle. Interesting Facts about Alternate Exterior Angles Alternate exterior angles are congruent if the lines crossed by the transversal are parallel. 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 anglesAngles that are on the opposite sides of the transversal are called alternate angles eg.