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What is an acute angle?

  1. An angle measuring less than 90 degrees

  2. An angle measuring more than 180 degrees

  3. An angle measuring exactly 90 degrees

  4. An angle measuring more than 90 degrees but less than 180 degrees

The correct answer is: An angle measuring less than 90 degrees

An acute angle is an angle that measures less than 90 degrees. This means that option B, which states that an acute angle measures more than 180 degrees, is incorrect. Option C, which states that an acute angle measures exactly 90 degrees, is incorrect because a 90 degree angle is considered a right angle, not an acute angle. Option D, which states that an acute angle measures more than 90 degrees but less than 180 degrees, is incorrect because that would describe an obtuse angle, not an acute angle.