A polygon is any contained shape made up of any number of straight lines. A quadrilateral is any polygon which has four sides. So we want a shape made of straight lines which doesn't have four sides. One example of this would be a triangle. Another example would be a pentagon. Another still would be a hexagon.
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No. There can be no regular concave polygon.
which type of quadrilateral is never a regular polygon
A four-sided quadrilateral is always classified as a polygon.
A polygon is a shape joined together by 3 or more lines such as a triangle, a quadrilateral, a pentagon, an hexagon ..... etc
quadrilateral