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Earn +20 ptsQ: What is a re-entrant quadrilateral?
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What kind of polygon has the property that there is a line which contains a side of the polygon and passes through the interior of the polygon?
It is a concave or reentrant polygon.
Is a trapezoid always a quadrilateral?
No. A quadrilateral is any four-sided figure. A trapezoid is one example of a quadrilateral.
An quadrilateral parallelogram?
Yes, such a quadrilateral can exist.
What is a quadrilateral parallelogram?
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
Why is a parallelogram always a quadrilateral but a quadrilateral is only sometimes a parallelogram?
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.
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