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What is the measurement of a right angle?

  1. Less than 90°

  2. Exactly 90°

  3. More than 90° but less than 180°

  4. Exactly 180°

The correct answer is: Exactly 90°

The measurement of a right angle is exactly 90 degrees. This is a fundamental concept in geometry, where angles are categorized based on their degrees. A right angle specifically represents a quarter turn on a circle, which corresponds perfectly to 90 degrees. In contrast, angles that are less than 90 degrees are known as acute angles, while those that measure more than 90 degrees but less than 180 degrees are referred to as obtuse angles. An angle that is exactly 180 degrees is a straight angle, which represents half a turn on a circle. Thus, the definition of a right angle is precisely encapsulated by the measurement of 90 degrees.