Lines and are parallel and are intersected by a transversal

MATHEMATICS · Subjective · CBSE · Mathematics · Lines and Angles · Lines and Angles

Problem

Lines

a

and

b

are parallel and are intersected by a transversal. The two interior angles on the same side of the transversal are labelled

\angle P

and

\angle Q

. State whether

\angle P + \angle Q

equals

90^\circ

180^\circ

or neither, and give a brief reason.