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: [[Right Angle|right angle]]s are labelled between two lines that cross over at 90° to each other.
: Two lines at [[Right Angle|right angle]]s may be called '''perpendicular'''.
: A line at [[Right Angle|right angle]]s to a surface is called a [[Normal Line(Physics)|'''normal''' line]].
: The [[angle]]s inside a [[square]] or [[rectangle]] are [[Right Angle|right angles]].
{| class="wikitable"
: [[Right Angle|right angle]]s are labelled between two lines that cross over at 90° to each other.
: Two lines at [[Right Angle|right angle]]s may be called '''perpendicular'''.
: A line at [[Right Angle|right angle]]s to a surface is called a [[Normal Line(Physics)|'''normal''' line]].
: The [[angle]]s inside a [[square]] or [[rectangle]] are [[Right Angle|right angles]].
{| class="wikitable"