Four equal sides; opposite sides parallel; four right angles.

Equal; bisect one another at \(90^\circ\); bisect the corner angles.

Opposite sides equal and parallel; four right angles.

Four equal sides; opposite sides parallel; opposite angles equal.

Bisect one another at \(90^\circ\); bisect the corner angles.

Opposite sides equal and parallel; opposite angles equal.

Two pairs of equal adjacent sides; one pair of equal opposite angles.

Cut at \(90^\circ\); the main diagonal bisects the other.

Properties of Quadrilaterals