EXTERIOR ANGLES The angles whose arms do not include the line segment PQ are called exterior angles.

Interior angles the angles whose arms include line segment PQ are called interior angles.

Exterior of an angle

Alternate exterior angles a pair of angles in which one arm of each of the angles is on opposite side of the transversal and whose other arms are directed in opposite direction and do not include segment PQ is called a alternate exterior angles.

State exterior angle theorem

State exterior angle theorem

What is the measure of each exterior angle?

ALTERNATE EXTERIOR ANGLES A pair of angles in which one arm of each of the angles is on opposite sides of the transversal and whose other arms are directed in opposite direction and do not include segment PQ is called a pair of alternate exterior angles.

EXTERIOR ANGLE If the side BC of a triangle