Quadrilaterals

Quadrilateral is a polygon with 4 sides.

Parallelogram is a quadrilateral with both pair of opposite sides parallel.

• Opposite sides of a parallelogram are congruent.

• Opposite angles of a parallelogram are congruent.

• Consecutive angles of a parallelogram are supplementary.

• Diagonals of a parallelogram bisect each other.

Rectangle is a quadrilateral with 4 right angles

• Diagonals of a rectangle are congruent.

Rhombus is a quadrilateral with 4 congruent sides.

• Diagonals of a rhombus are perpendicular.

• Diagonals of a rhombus bisect each other.

• Diagonals of a rhombus bisect opposite angles.

Trapeziod is a quadrilateral with one pair of opposite sides parallel.  

Isosceles Trapezoid has congruent legs.
Median of a trapezoid is ½ the sum of the bases.

Example Problems