Yes, parallel means that two lines do not cross but lay side-by-side. Perpendicular is the opposite of parallel and means two lines intersecting.
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A square has four parallel sides (two pairs of parallel sides).
I am guessing you mean a right angled triangle. The hypotenuse is the longest side on a right angled triangle. So it is the side facing / parallel to the right angle.
no, only one side of parallel lines
It is not possible to have 1 parallel side since it must be parallel to another side. A four sided shape with 1 PAIR of parallel sides is a trapezium (or trapezoid).
because they are side by side