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# Intro to quadrilaterals

Sal discovers attributes and features of four-sided shapes, including parallelograms, rhombuses, rectangles, and squares.

## Want to join the conversation?

• why is a square a rectangle but a rectangle is not a square?
• Good question... a rectangle can't be a square because a square has all four sides the same length. A rectangle has two sides of the length, but it's also the same thing on the shorter lines. So, in summary, a square and a rectangle are the same.
• why do i keep thinking a rhombus is a square? Is my mind playing tricks on me?
• yes it is
• i thought a rhombus was a diamond wieard right
• Yes, a rhombus is shaped like a diamond. The exact definition of a rhombus is a quadrilateral with four equal sides.
• why is a square a rectangle
• A square has all the properties of a rectangle. They both have interior 90 degree angles, are quadrilaterals, and have to sets of parallel lines that are equal.
• Assuming the inclusive definition of trapezoid is used where it includes parallelograms(which is the definition wikipedia uses) than a parallelogram is a trapezoid. Does this mean that a trapezoid is a parallelogram?
• In my country (Romania), I learn that a trapezoid is a convex quadrilateral with EXACTLY 1 set of parallel sides, so it's never a parallelogram and never is a parallelogram a trapezoid.
• what are these comments dawg
• commet on this if your cool
• why do u talk a lot?