Definition
Right angle
A right angle measures exactly 90°, which is one quarter of a full turn.
Continue from this idea into connected AXIO math.
What it means
Turn one quarter of the way around: that is a right angle. It can point up, down, left, right, or diagonally; its direction does not change its 90° measure.
Remember it
Quarter-turn, square-corner angle.
Example
On a clock, the hands at 12 and 3 are three hour marks apart. Each mark is 30°, so the angle is 3 × 30° = 90°. It is a right angle.
Watch for
An angle of 89° or 91° may look close, but it is not a right angle.
Common mix-up
The word “right” names the 90° angle; it does not mean the angle must face right.
Exact meaning
A right angle is formed by two rays that meet at a 90° angle. It is often shown with a small square at the vertex.