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Definition of right angle for Students. : an angle formed by two lines that are perpendicular to each other : an angle of 90 degrees.
Note the special symbol like a box in the angle. If we see this, it is a right angle. The 90Â° is rarely written in. If we see the box in the corner, we are being told it is a right angle. All the angles below are right angles: A right angle can be in any orientation or rotation as long as the internal angle is 90Â°.