Idempotent

Geometric mean is a topic in geometry that is only used to calculate a pointless length in right triangles. It is a throwaway topic, right? If your students are tired of having their time wasted memorizing calculations they will never use again, they will be demanding to know why they should learn about the geometric mean. Included are three mini-lessons -- one each for geometry honors, precalculus honors, BC calculus. You are saying, "But I only teach, geometry. Why would I bother paying f

Contained are wall posters for a Geometry classroom which show the main theorems in a minimalist style suitable for a word wall or anchor chart display. They are functional and easy to read, not pretty. The presentation does not use symbols other than the name of the concept. The presentation does include occasional auxiliary lines which are used in proving the theorem from prior concepts. They are an aid to memory, not a replacement for it and are therefore suitable to remain hung during an

This module is intended for approximately three weeks of instruction. It teaches basic probability from the perspective of set notation as required by the CCSS. Students will learn and practice set notation for union, intersection, and complement. All of the knowledge that students have built regarding sets is translated into equivalent concepts in probability. The final week includes a connection with geometry in which students calculate probability from their knowledge of length, area, and

Special Relativity (SR) is a way of describing space and time developed by Albert Einstein. This lab will guide students through discovering the surprising effects of thinking of space and time in a new way. Rather than using a physical lab experiment, the students will follow Einstein's method of gedanken (thought) experiments. That means less setup and cleanup for the teacher! It DOES NOT follow the usual presentation of SR with bouncing photons which confuses thousands of college students

This lab has students apply their knowledge of the Triangle Angle Sum Theorem to derive the sum of the measures of the interior angles of a polygon (the Polygon Angle Sum Theorem). As opposed to having students memorize a formula, the lab approach requires students to be creative and synthesize multiple mathematical ideas from geometry and algebra. Pre-planning: 30-60 minutes decide how students will get into pairs Prerequisite Knowledge: the triangle angle sum theorem arithmetic sequences mode