Two lines are parallel when they are perfectly straight, side by side. Train tracks for example. The symbol for parallel is: (I.E. AB)
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A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
For two lines to be parallel they must have the same slope. A line parallel to a line with slope -2 would have a slope of -2.
The shortest distance between 2 parallel lines is a perpendicular drawn between 2 parallel lines the diagram shows it clearly 1 parallel line ------------------------------------|-------------------------------------------------------------------- | | | the vertical line is the shortest distance | | ------------------------------------|------------------------------------------------------------------- 2nd parallel line
I always remembered parallel line because of the 2 "L's" in parallel. They are perfectly parallel to each other and will never intersect. The slope of a line is the rise over run, or rise/run. Therefore if both lines are parallel, the slopes of the lines are the same.
A cone does not have any parallel lines