Maybe all the ones you talk about in school have at least one pair of equal sides,
but there are an infinite number of other quadrilaterals that have no equal sides.
Take four sticks ... 1 foot, 2 feet, 3 feet, and 4 feet. There's no problem gluing
their ends together to make an ugly, out-of-shape quadrilateral.
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No, because all quadrilaterals have 4 straight sides.
yes
A trapezoid (or trapezium) has at least one pair of parallel sides.If you asked, "Name all the types of quadrilaterals which have at least one pair of parallel sides?", I would answer: Trapezoid, rhombus, parallelogram, rectangle and square.
A kite, a square or a rhombus
A trapezium and a parallelogram are both quadrilaterals with at least one pair of parallel sides.