Mathematics

Problem

Lines

p

and

q

are cut by a transversal

t

. Which one of the following statements, if true, is NOT sufficient by itself to prove that

p

and

q

are parallel? a)

\text{A pair of alternate interior angles are equal.}

\text{A pair of alternate exterior angles are equal.}

\text{A pair of vertically opposite angles are equal.}

\text{A pair of corresponding angles are equal.}