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It can, but not necessarily. The term quadrilateralrefers to any 4-sided polygon. This does not give you any information on the lengths or equalities of any sides or angles.
The subgroup of quadrilaterals that has equal opposite sides (because there are two sets of parallel sides) is a parallelogram.
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Quadrilateral with congruent sides and no right angles?
rhombus. The rhombus is a quadrilateral with all sides equal in length. It is also a parallelogram, so opposite sides are parallel and equal in length, and opposite angles are equal.
If a quadrilateral is a parallelogram the opposite sides are?
Equal and parallel
What is a quadrilateral with opposite sides that are equal and parallel?
A parallelogram.
What are the opposite sides if a quadrilateral is a parallelogram?
They are equal and parallel.
What quadrilateral has no equal angles and its opposite sides are parallell?
It is not possible for a quadrilateral in Euclidean plane geometry to have no equal angles and still have its opposite sides parallel.It's possible for a quadrilateral to have no equal angles and two of its sides parallel (opposite ones, obviously; adjacent sides can't possibly be parallel). That would be a trapezoid.
