Trapezoid Special Notes! The length of the mid-segment is the average of the lengths of the parallel sides. Trapezoid Definition: A quadrilateral with a pair of parallel sides.

Parallelogram Definition: A quadrilateral opposites sides parallel. Special Notes! Adjacent angles are supplementary. Opposite sides are congruent. Opposite angles are congruent. Diagonals bisect each other. Parallelogram

Isosceles Trapezoid Definition: A quadrilateral with two parallel sides (called bases) whose non parallel sides are congruent. Special Notes! Angles adjacent about the non-base sides are supplementary! Length of mid-segment is the average of the bases.

Rhombus Special Notes! Opposite sides are parallel. All of the properties of a parallelogram hold!  Diagonals are perpendicular. Definition: A quadrilateral with four congruent sides.

Rectangle Special Notes! All the angles are right-angles. All the properties of a parallelogram hold. Rectangle Definition: A parallelogram with one right angle.

Kite Special Notes! Angles between congruent sides are called vertex angles. Angle between non-congruent sides are called non-vertex angles. Diagonals are perpendicular. The diagonal between non-vertex angles is bisected by the diagonal between vertex angles. NON-VERTEX ANGLES VERTEX ANGLES Definition: A quadrilateral with two pairs of congruent adjacent sides.

Square Definition: A rhombus that is a rectangle. Special Notes! Life's most perfect shape. It a regular quadrilateral All the properties of a parallelogram hold. Diagonals are perpendicular. A square is also a trapezoid. A square is also a parallelogram. A square is also a rhombus. A square is also a rectangle. A square is also a kite. Square