Determine whether the conditional and its converse are both true. If both are true, combine them as a biconditional. If either i
s false, provide 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 an angle is 90 if and only if it is not a right angle. One statement is false. If an angle is a right angle, its measure may be 180. One statement is false. If an angle measure is 90, the angle may be an obtuse angle.
If an angle is a right angle, its measure is 90. If an angle measure is 90, the angle is a right angle.
The answer is: Both statements are true.
This is the biconditional. An angle is a right angle if and only if its measure is 90°.
Other types of angles:
Acute angle - less than 90°
Obtuse angle - more than 90° but less than 180°.
Straight angle - exactly 180°
Reflex angle - more than 180°