There are quadrilaterals that have no parallel sides. (basically, a quadrilateral is just any enclosed shape with 4 sides) But all quadrilaterals have angles.
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A quadrilateral that is neither a trapezoid nor a parallelogram can be a general irregular quadrilateral, where none of the sides are parallel and the angles are not equal. Examples include a kite (which has two pairs of adjacent sides that are equal but does not have parallel sides) or an arbitrary four-sided shape with no specific properties. Such a shape does not conform to the definitions of trapezoids or parallelograms, which require specific relationships between the sides and angles.
The geometric answer is a rectangle but that does not have 13 letters. The answer is NOT a quadrilateral nor parallelogram because neither of them need have 4 right angles.
It may be. A quadrilateral has four sides, but they need not be all the same length, nor parallel to each other. It's true that a parallelogram *is* a quadrilateral.
A quadrilateral can have two right angles and still not be a rectangle, if one side is oblique (neither right nor parallel) to the others, but three right angles force the fourth, and you have a rectangle.
NO! DEFINITELY NOT!!! A circle has NO sides at all! A quadrilateral has four sides. A quadrilateral is a polygon with four sides. For example: the square, the rhombus, the rectangle etc.. A circle measures 360 centimetres in circumference. This so because there has to be some way to measure the circle, and mathematicians came up with this strategy, I don't know how (yet). The point is the circle cannot have sides or angles because it is completely round, and a round figure cannot have sides nor angles.