Geometry section of

NOTE: The re-posting of materials (in part or whole) from this site to the Internet is copyright violation
and is not considered "fair use" for educators. Please read the "Terms of Use".

** Note: This section uses the inclusive definition of "trapezoid".

* calculator link
General Information Regarding Quadrilaterals (w/ symmetry info: rotational & reflectional)
Theorems Dealing with Parallelograms (with proofs of theorems)