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Q: What is a non-convex quadrilateral?

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Every rhombus is a quadrilateral, but not every quadrilateral is a rhombus.

Yes, such a quadrilateral can exist.

A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.

A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.

A quadrilateral has 4 sides.

Related questions

A nonconvex polygon is a concave polygon. All polygons with 4 or more sides can be concave. An arrowhead is an example of a concave quadrilateral. The back of an envelop (where the sides are folded and glued together) is a concave pentagon.

Not necessarily.

A triangle is normally nonconvex on a flat surface

None. They either consist of curved sides or are not closed shapes (have lines "sticking out").

If it is a quadrilateral it cannot be "not a quadrilateral"!

A quadrilateral is a polygon with four sides. A rectangle is a quadrilateral

Every rhombus is a quadrilateral, but not every quadrilateral is a rhombus.

It is an inscribed quadrilateral or cyclic quadrilateral.

A quadrilateral is a polygon with four sides. A rectangle is a quadrilateral.

A series of transformations on quadrilateral S resulted in quadrilateral T. The angles of quadrilateral S and T are congruent but the sides of quadrilateral T are twice as long as quadrilateral S. Which transformation on quadrilateral S must be included to result in quadrilateral T * sorry thats the full question!

No, a semicircle is not a quadrilateral

No, a quadrilateral does not bisect.

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