Pythagorean Theorem

Free to teach as-is — the teacher guide, student handout, and slides are included.

Free — we'll email you an access link. Google Docs format.

Objective

I can use the Pythagorean Theorem (a² + b² = c²) to determine if a triangle is a right triangle

Part 1 of 3

Warm-up video

Professor Dave Explains · 5:02Vetted channel

We don't generate video — this one is by Professor Dave Explains on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

Part 2 of 3

Practice

7 questions

1

Define the terms "legs" and "hypotenuse" in the context of a right triangle.

2

State the Pythagorean Theorem and explain what each variable (a, b, c) represents.

Part 3 of 3

Exit ticket

Quick comprehension check

A triangle has sides of length 9, 12, and 15. Is this a right triangle? Show your work. A triangle has sides of length 4, 5, and 6. Is this a right triangle? Show your work. A triangle has sides of length 7, 24, and 25. Is this a right triangle? Show your work.

Sample answer included in the free materials

Get the materials

Teacher guide, student handout, and slides — free, in Google Docs format

  • Teacher Guide

    Complete lesson plan with answer keys and alternate activities

  • Student Handout

    Printable worksheet

  • Slides

    Ready to present

We'll ask for your email to send your access link — nothing else.

Teaching a group at a different level?

Where are your students right now? We'll rebuild this lesson to match — including the teacher guide, student handout, and slides, saved to your Google Drive.

Adapt This Lesson