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The little square indicates that this is a right angle

A right angle is an angle with a measurement of 90 degrees. When two lines cross each other so that all the angles have the same size, the result is four right angles. The top of the letter T is at right angles to the vertical line. Walls of buildings are usually at right angles to the floor. Two things that are at right angles are called "perpendicular" or "orthogonal". This is expressed using the \displaystyle{ \bot } symbol (such as in \displaystyle{ \ell_1 \, \bot \, \ell_2 }).

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Identifying Parallel and Perpendicular Lines

Identifying Parallel and Perpendicular Lines
Perpendicular Lines

Perpendicular Lines
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