quadrilateral vs rectangle

are all rectangles quadrilaterals

Are All Rectangles Quadrilaterals: Rectangles Are

Yes, all rectangles are quadrilaterals. A rectangle has 4 sides, 4 vertices, and 4 right angles, so it fits the definition of a quadrilateral and then adds extra rules of its own. That feels backward to some students at first. They look at a rectangle and think, “That's