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Quadrilaterals are any 4 sided shapes like squares, rectangles, parallelograms, kites .... etc
If you didnt have a clock you would be late or early for stuff and have to ask other people for the time alot. If no one had a clock people would probably use the sun to tell time. But an economy of such complexity as ours would have a more difficult time operating.
Not necessarily. All parallelograms are quadrilaterals but not all quadrilaterals are parallelograms. Parallelograms are more specific instances of quadrilaterals. Its like saying all squares are rectangles but not all rectangles are squares.
They are both quadrilaterals.