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What type of angle is 45 degrees?

  1. Right angle

  2. Straight angle

  3. Acute angle

  4. Obtuse angle

The correct answer is: Acute angle

A 45 degree angle is known as an acute angle. An acute angle is any angle that measures between 0 and 90 degrees. In contrast, a right angle measures exactly 90 degrees, a straight angle measures 180 degrees, and an obtuse angle measures between 90 and 180 degrees. Therefore, options A (right angle), B (straight angle), and D (obtuse angle) are all incorrect.