Quadrilateral

1. Rectangle

1.1. Diagonals are congruent

1.2. Four right angles

1.3. Diagonals are congruent

1.4. Rhombus

1.4.1. Diagonals bisect a pair of opposite angles

1.4.2. Diagonals are perpindicular

1.4.3. Square

1.4.3.1. Four congruent sides

1.4.3.2. Four congruent angles

2. Parallelogram

2.1. Opposite sides are congruent

2.2. Consecutive angles are supplementary

2.3. Opposite angles are congruent

2.4. Diagonals bisect each other

2.5. Angle is supplementary to its consecutive angles

2.6. Opposite sides are parallel and congruent

3. Trapezoid

3.1. Midsegment is parallel to the bases

3.2. Length of the mid segment is 1/2 the sum of the bases

3.2.1. Isosceles Trapezoid

3.2.2. Diagonals are congruent

3.2.3. Each pair of base angles is congruent

4. Kite

4.1. Diagonals are perpidicular

5. Polygon Angle Measures

5.1. The sum of the interior angles in an n-gon: (n-2)180, n=# of sides

5.2. The measure of each interior angle in an n-gon: (n-2)180/n

5.3. The sum of the measures of the exterior angles of a regular polygon, one at each vertex, is 360