Need help figuring out biconditional statements

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. ) Both statements are true. An angle is a right angle if (and only if) its measure is 90. Both statements are true. The measure of angle is 90 if (and only if) it is not a right angle. O One statement is false. If an angle measure is 90, the angle may be a vertical angle. O One statement is false. If an angle is a right angle, its measure may be 180