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Perpendicular lines formed right angles.
If AB is a perpendicular bisector of CD then four 90 degreee angles are formed.
They're supplementary
Right angles are formed by perpendicular lines. If the lines would extend, to make two intersecting lines, they would form four right angles. Perpendicular lines are written like this: . From its shape, you can already tell that it forms at least two right angles.
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