Two lines that form a right angle are Perpendicular. This can be show by an upside down T.
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Their are Perpendicular.
Perpendicular lines
Two of the three lines in a right triangle are perpendicular. Perpendicular lines meet at a 90 degree angle (also called a right angle). All right angle triangles have one right angle.
When two perpendicular lines cross, a right angle is formed.
A right angle.