Colleen Ritzer had the challenging job of getting sleepy, slouching high school students to work geometry proofs — the tedious building of evidence to show that two angles are congruent, or two lines ...

Proving that two polygons have the same area can be as easy as cutting them up and rearranging the pieces. Gina the geometry student stayed up too late last night doing her homework while watching The ...

Revise the different types of angles and rules for calculating angles. This guide includes interactive activities and a quiz. NEW: Angles in parallel lines Revise alternate, correspondent or ...