a symmetrical line.
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Perpendicular lines
Example: 3/2= 1 and 1/2 There are three halves in 3/2. You add two halves and get 1. You take the remaining half and put it on the end which make 1 and 1/2.
Railway lines are parallel
Lines that form a 90 degree angle at their vertex. Two lines that make a 90 degree are perpendicular.
Perpendicular lines make four 90 degree angles otherwise known as right angles.