It could be referring to a perpendicular line
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I am pretty sure in math, it is called a diameter
A line is a group of points on a straight path that extends to infinity
When you draw a circle in math, and you draw a triangle inside of it, 2 of the lines should be the radius of the circle, and the third (bottom) line that is not the radius is the chord.
co-linear points?
do you mean math equation? If you add a number to both sides of an equation you do not change it. That is called algebra