No. Not any pentagons are quadrilaterals, quadrilaterl mean Quad or Four. So it would have to have 4 equal sides and that's impossible because Pentagon means penta or five. So it cant be a Quadrilateral.
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Non-quadrilaterals contain triangles, circles, pentagons, octagons, hexagons, and stars.
37 sides
Not all quadrilaterals are rectangles. Some quadrilaterals are rectangles, and the rest are not. However, all rectangles are quadrilaterals.
No, it is true of all pentagons.
All rectangles are quadrilaterals. A quadrilateral has 4 sides; all rectangles have 4 sides; thus all rectangles are quadrilaterals.