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How many degrees is a right angle?

  1. 45 degrees

  2. 60 degrees

  3. 90 degrees

  4. 120 degrees

The correct answer is: 90 degrees

A right angle measures 90 degrees. This measurement is fundamental in geometry and is defined as the angle formed when two lines intersect perpendicularly. The concept of a right angle is critical in various applications, ranging from architecture to carpentry, and serves as a reference point for other angles. The answer correctly identifies this standard measurement of a right angle, differentiating it clearly from other common angles, such as those measuring 45 degrees, 60 degrees, or 120 degrees, which have different applications and characteristics within geometric principles.