Right Angle

A right angle is an angle that measures exactly 90 degrees ($90^\circ$), corresponding to a quarter of a full circle. Lines or line segments that meet at a right angle are said to be perpendicular to each other.

Example

The corners of a standard sheet of paper form right angles. In a right-angled triangle, the angle opposite the hypotenuse is exactly $90^\circ$.

See Also

• Perpendicular
• Acute Angle
• Obtuse Angle