Question

#5 rewrite the definition as a biconditional statement. two angles are vertical angles when their sides form two pairs of opposite rays.

Explanation:

A biconditional statement combines a conditional statement and its converse. The given definition of vertical angles can be rewritten as a biconditional by stating both "if - then" and "only if" relationships.

Answer:

Two angles are vertical angles if and only if their sides form two pairs of opposite rays.