1. Quadrilaterals

2. Definition A Polygon with 4 sides and 4 angles.

3. The sum of all interior angles in a quadrilateral is 360 o. What is the value of X? X=360–(70+70+110) X=110 70 o X o 110º o 70 o

4. Types of Quadrilaterals

5. Trapezium 4 sides, 4 angles Trapezoid Only 1 pair of parallel sides Parallelogram Opposite sides are parallel and congruent Rectangle A parallelogram with 4 right angles Rhombus A parallelogram with 4 congruent sides Square A rectangle with 4 congruent sides