Quadrilateral
A quadrilateral is a four-sided polygon. Some common quadrilaterals are squares, rectangles, rombuses, parrallelograms, trapezoids and kites.
Contents
Introductory topics
Resources
Books
Intermediate topics
Resources
Books
- Challenging Problems in Geometry -- A good book for students who already have a solid handle on elementary geometry.
- Geometry Revisited -- A classic.