This geometry lesson from Illuminations presents a real-world problem for students to solve with mathematical functions. The material involves constructing the circumcenter and incenter of a triangle. Learners will gain...

This geometry lesson from Illuminations involves using sidewalk chalk and rope to illustrate the locus definitions of ellipses and parabolas. Students will define conic sections, apply locus definitions and collaborate...

Simple constructions; constructing regular polyhedra; symmetry; and some group theory.

A 3rd grade lesson plan on "Seeing Near and Far": students learn how overlapping and size differences show perspective, and that on a level surface, the lowest part of a near subject is lower in a picture than the lowest...

This geometry lesson from Illuminations introduces a hands-on learning activity for students in grades 9-12. The class will use pasta to create models of triangles. They will examine the relationship between sides and...