Final answer:
The term for angles outside a pair of parallel lines, formed by a transversal, is 'Exterior.' Exterior angles are used to define relationships such as alternate exterior angles and are subject to the exterior angle theorem in triangles. The correct answer is D. Exterior.
Step-by-step explanation:
The word used for angles outside the pair of parallel lines is Exterior. When two parallel lines are intersected by a transversal, several types of angles are formed.
The angles that are on the outer sides of the parallel lines, but inside the boundary of the transversal line are called exterior angles.
In contrast, the angles on the inner side of parallel lines are called interior angles. Exterior angles are important for identifying various angle relationships such as alternate exterior angles, which are equal when the lines are parallel, and the exterior angle theorem which states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the opposite interior angles.
The word used for angles outside the pair of parallel lines is Exterior. Exterior angles are formed when a transversal intersects two parallel lines. They are found outside the parallel lines, and their measures are equal to the sum of the two remote interior angles.