a. An angle is a right angle if and only if its measure is 90°
b. An angle is acute if and only if its measure is less than 90°
c. Two angles are congruent if and only if its measure are the same.
d. An angle is obtuse if and only if its measure is greater than 180°
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Home » Mathematics » Which biconditional is NOT a good definition? a. An angle is a right angle if and only if its measure is 90° b. An angle is acute if and only if its measure is less than 90° c. Two angles are congruent if and only if its measure are the same. d.