Which angle measures exactly 90°?

Which angle measures exactly 90°?

• A. Acute angle
• B. Obtuse angle
• C. Right angle
• D. Straight angle

Answer: (C)

A right angle is defined specifically as an angle that measures exactly 90 degrees. This angle is a fundamental concept in geometry and is often represented by a square symbol placed at the vertex of the angle. The right angle serves as a standard reference point for classifying other types of angles: acute angles are less than 90 degrees, obtuse angles are greater than 90 and less than 180 degrees, and straight angles measure exactly 180 degrees. Understanding the right angle is crucial for various applications in mathematics, construction, and design, as it commonly appears in geometric figures and helps establish perpendicular lines.

A right angle is defined specifically as an angle that measures exactly 90 degrees. This angle is a fundamental concept in geometry and is often represented by a square symbol placed at the vertex of the angle. The right angle serves as a standard reference point for classifying other types of angles: acute angles are less than 90 degrees, obtuse angles are greater than 90 and less than 180 degrees, and straight angles measure exactly 180 degrees. Understanding the right angle is crucial for various applications in mathematics, construction, and design, as it commonly appears in geometric figures and helps establish perpendicular lines.