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Rotational symmetry.
how many lines of symmetry does a pencil have ? the answer is one if you hold up a pencil there is only one way or it would be uneven any way else the first way is if you are like-laying it down and go across the pencil but not in half
Vertical lines are lines that are drawn / made perpendicular to the horizon. In other words, they go "ceiling to floor", not "wall to wall" or "corner to corner."
two straight lines that will never intersect. ex. ___________ _____________ the lines go straight and never met.
They will remain horizontal lines. A line parallel to the x-axis will remain a line parallel to the x-axis no matter how far back into space they go.