A right angle is a corner formed by two perpendicular sides, matching the square corner of a familiar rectangular object or representing a quarter-turn, regardless of its orientation. Learners identify right angles in drawings and common two-dimensional shapes and distinguish them from narrower or wider angles; this informal recognition does not include measuring angles in degrees or using formal angle calculations, which support later geometry.
A right angle is a corner that matches the square corner of a book, sheet of paper, or window. It is also like making a quarter-turn: turn from one side to the other side until you face a direction that is straight across.
The corner can point any way. It does not have to point up, down, left, or right.
Example: Is the angle below a right angle?
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The angle is still a right angle if the whole picture is turned or tilted.
If the opening is smaller than a square corner, it is narrower than a right angle. If the opening is larger, it is wider than a right angle.
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