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Which biconditional is NOT a good definition?

AAn angle is a right angle if and only if its measure is 90°
BAn angle is acute if and only if its measure is less than 90°
CTwo angles are congruent if and only if its measure are the same.
DAn angle is obtuse if and only if its measure is greater than 180°

Verified Answer :

The answer is d because an obtuse angle can be anything over 90°

syed514

Two angles are congruent if and only if its measure are the same is not a good definition because congruent angles sometimes does not has the same measures.

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