Right angle
A right angle is one quarter of a revolution. Four right angles make one revolution. A right angle measures 90°. Right angles can be seen in our homes and school buildings.
We can make a right angle by folding a piece of paper in half, and then in half again to make a 'corner'.
All of the angles we have seen so far are based on the revolution. Many other types of angles are based on the right angle.
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