Lines and are cut by a transversal

MATHEMATICS · Subjective · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

Lines

\ell

and

m

are cut by a transversal

t

. One angle lies between

\ell

and

m

on the left side of

t

, and another lies between the two lines on the right side of

t

. Explain why these two angles form an alternate interior pair.