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A quadrilateral is a polygon with four sides. Quadrilaterals can be classified into several types based on their properties. Here are the properties of some common quadrilaterals:

Square:

• All sides are equal in length.
• All angles are right angles (90 degrees).
• The diagonals are perpendicular and bisect each other.

Rectangle:

• All sides are equal in length.
• Opposite angles are equal.
• The diagonals are perpendicular and bisect each other.

Rhombus:

• All sides are equal in length.
• Opposite angles are equal.
• The diagonals are perpendicular.

Trapezoid:

• Two sides are parallel and the other two sides are not parallel.
• The angles between the parallel sides are equal.

Parallelogram:

• Both pairs of opposite sides are parallel and equal in length.
• The opposite angles are equal.
• The diagonals bisect each other.

Kite:

• Two pairs of adjacent sides are equal in length.
• The opposite angles are equal.
• The diagonals are perpendicular.

In summary, a quadrilateral is a polygon with four sides.