Free lesson: The Pythagorean Relationship (Grade 9 Math)
Try a complete lesson free: students draw squares on the sides of triangles to discover a² + b² = c², find missing sides, and learn the carpenter's 3-4-5 check for square corners.
This is a complete lesson from MTH1W Unit 5, Geometry and Measurement, free to download and use. It's exactly what you get in the paid units, so you can see the quality before you buy.
Students draw squares on the sides of right and non-right triangles on grid paper, discover that a² + b² = c² works only for right triangles, and use it to find missing hypotenuses and legs. They test whether triangles are right-angled and finish with the carpenter's 3-4-5 check for a square deck corner. All you need is grid paper, rulers and calculators.
What you get
- A teacher lesson plan built on the 2021 Grade 9 Mathematics curriculum (MTH1W), with expectations, learning goals, success criteria, a timed sequence, differentiation and a worked answer key
- A slide deck with speaker notes on every slide, including guided practice and answer slides
- A two-page student handout: Discover It and Find the Side
- Editable Word and PowerPoint files, plus PDFs
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