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Right angle

A  right angle is one quarter of a revolution. Four right angles make one revolution. A right angle measures 90°. We draw a small square in the corner of a right angle to show that it is equal to 90°. Right angles can be seen in our homes and school buildings.

Square and wall with right angles marked.
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We can make a right angle by folding a piece of paper in half and then in half again to make a 'corner'.

Making a corner with paper.
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All of the angles we have seen so far are based on the revolution. Many other types of angles are compared to the right angle.