If they were not actually parallel then they would not be parallel lines!
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If L1 is parallel to L2 and L2 is parallel to L3 then L1 is parallel to L3.
The opposite sides are parallel to each other
A square has parallel sides. A rectangle has parallel sides.
Any circuit that even has more than one branch is a parallel one.
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a disk which is parallel
A structure that is parallel.
Yes. A rhombus is parallel. Or also called a parallelogram. It's parallel because it is a quadrilateral with 4 parallel sides.