Question

Determine whether the conditional and its converse are both true. If both are true, combine them as a biconditional. If either is false, give a counterexample.
If an angle is a right angle, its measure is 90.
If an angle measure is 90, the angle is a right angle.

Answer 1

The conditional and its converse are true, and the biconditional is
An angle is a right angle if and only if its measure is 90.