1. Quadrilateral
Definition: Any closed four-sided figure.
Some Examples:

2. Trapezoid
Definition: A quadrilateral with exactly one pair of parallel sides.
Picture: Opposite sides marked parallel.

3. Kite
Definition: A quadrilateral with two distinct pairs of consecutive congruent sides.
Picture: Sides next to each other marked congruent.

4. Parallelogram
Definition: A quadrilateral with two pairs of parallel sides.
Picture: Marked parallel and congruent.

5. Rhombus Definition: Two pairs of parallel sides and 4 congruent sides.
Picture: Marked parallel and congruent.

6. Rectangle
Definition: Two pairs of parallel sides and 4 congruent angles
Picture: Marked parallel, congruent and 4 right angles.

7. Square Definition: 4 congruent sides and 4 congruent angles
Picture: Marked parallel, congruent and four right angles.