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Q: What is defined to be a quadrilateral in which both pairs of opposite sides are parallel a regular polygon b concave polygon c parallelagram d octagon?

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No. A trapezoid has two parallel sides. This is not possible in a concave quadrilateral.

concave

A concave quadrilateral would be a non-convex quadrilateral. * * * * * Also known as delta or arrowhead or chevron.

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A concave quadrilateral - like an arrowhead or chevron.

concave concave

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A chevron or arrowhead.

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A trapezoid (UK trapezium) is a quadrilateral has only one pair of parallel sides. Otherwise, there are many irregular quadrilaterals that have no parallel sides, such as a kite or dart shape, and these include both concave and convex quadrilaterals.

A concave quadrilateral. An arrowhead or a delta, for example.

No, a heptagon cannot be parallel but two heptagons can.A heptagon can be concave.

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