A right angle is ______.

A right angle is ______.

• A. Exactly 90 degrees
• B. Less than 90 degrees
• C. Greater than 90 degrees
• D. Exactly 180 degrees

Answer: (A)

A right angle is defined by measuring exactly 90 degrees. It happens when two lines meet perpendicularly, forming a perfect corner like the corner of a square or a door frame. This precise 90-degree measure sets it apart from acute angles, which are smaller than 90, and obtuse angles, which are larger than 90 but less than 180. A straight angle, by contrast, is 180 degrees. In diagrams, a small square at the vertex often indicates a right angle. So the statement that a right angle is exactly 90 degrees is the correct description.

A right angle is defined by measuring exactly 90 degrees. It happens when two lines meet perpendicularly, forming a perfect corner like the corner of a square or a door frame. This precise 90-degree measure sets it apart from acute angles, which are smaller than 90, and obtuse angles, which are larger than 90 but less than 180. A straight angle, by contrast, is 180 degrees. In diagrams, a small square at the vertex often indicates a right angle. So the statement that a right angle is exactly 90 degrees is the correct description.