9th & 10th grade math - properties of quadrilaterals

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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

9th & 10th grade math - properties of quadrilaterals

Taught by: Cathy Humphreys

Mathematical Strand:
- Geometry: Congruence