Well, you see, parallel lines are lines that do not and will not ever intersect at any length of the line
No.
Two lines are parallel if and only if they have the same slope. Two lines are perpendicular if the product of their slopes is -1. If neither of these conditions are met, the lines are nether parallel, or perpendicular.
The transversal line cuts through the parallel lines that are equal distance apart and never meet together.
If the lines are straight and have the same slope they are parallel, no matter what the y intercept is
yes you can still determine the angle measure!
They could be: parallel lines, perpendicular lines or intersecting lines
The circles could be in 2 planes that are parallel to each other. Lines and planes can be parallel. Lines of latitude are examples of circles that are in parallel planes.
They could be lines with the same gradient (or slope).
No, parallel lines do not meet at a right angle. In theory, parallel lines never meet. In practice, parallel lines on earth could meet at the North Pole and/or the South Pole. Perpendicular lines meet at a right angle.
Not necessarily. They could be skew lines, and satisfy these conditions.
No. They could be parallel.
Yes you can.