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Write the definition as a biconditional.An acute angle is an angle whose measure is less than 90°.An angle's measure is less than 90° if it is acute.An angle is acute if and only if its measure is less than 90°.An angle is acute if and only if it is not obtuse.An angle is acute if its measure is less than 90°.

User LeizeQ
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Biconditional

Then the right answer is

An angle is acute if and only if its measure is less than 90°.

User Danny G
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