1. A quadrilateral is a polygon with four sides and four angles.
2. Some examples of quadrilaterals include squares, rectangles, parallelograms, rhombuses, and trapezoids.
3. The sum of the interior angles of a quadrilateral always adds up to 360 degrees.
4. The diagonals of a quadrilateral may or may not be equal in length, depending on the type of quadrilateral.
5. Quadrilaterals can be classified based on their properties, such as having equal sides, opposite angles being equal, or having 90-degree angles.
Quadrilaterals quick check
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