Created by Eddie Fuller, Lang Moore and David Smith for the Connected Curriculum Project, the purpose of this module is to investigate surfaces as functions of two parameters and to formulate a notion of area for...

This geometry lesson from Illuminations asks students to draw two line segments through a point on the diagonal of a parallelogram and parallel to the sides. Students will examine a geometric shape, analyze the patterns...

This lesson from Illuminations asks students to measure the diameter and circumference of various circular objects, plot the measurements on a graph, and relate the slope of the line to π, the ratio of circumference to...

This lesson offers help to students who will eventually write mathematical proofs. The material allows students to put together statements and reasons to build a formal proof. The lesson involves identifying the...

This geometry lesson introduces the Power of Points theorem. While it is often taught in three parts (the Chord-Chord Power theorem, the Secant-Secant Power theorem, and the Tangent-secant Power theorem), this lesson...