1. inv#6.notebook March 11, 2013
Investigation #6:
*quadrilateral - a 4-sided polygon
*parallelogram - a quadrilateral with 2 pairs of parallel sides
-->
*trapezoid - a quadrilateral with only 1 pair of parallel sides
-->
2. inv#6.notebook March 11, 2013
*trapezium - a quadrilateral with no pairs of parallel sides
-->
*rhombus - a parallelogram with all sides equal
-->