Inside Mathematics: 9th & 10th Grade Math - Properties of Quadrilaterals

This lesson is about properties of quadrilaterals and learning to investigate, formulate, conjecture, justify, and ultimately prove mathematical theorems.

The idea for the lesson came from two sources:

– The “Shape of Things” Problem of the Month and its related Teacher Notes

– The John Van de Walle mathematics series’ investigation of the diagonals of a quadrilateral

Taught By

Cathy Humphreys

Fremont High School, Fremont Union High School District, Sunnyvale, California

BEGIN LESSON

VIDEO CLIPS

MATERIALS & ARTIFACTS

STEAM Topics Resource Audience Grade Level

Math Topics

Geometry

High School, Educator

9th Grade, 10th Grade

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