The 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 find the length of a missing side of a right triangle when given the other two sides.

Part 1 of 3

Warm-up video

Unknown Channel · 5:00

We don't generate video — this one is by Unknown Channel 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

Explain in your own words what the Pythagorean Theorem is and when it can be used.

2

In a right triangle, the two shorter sides (legs) measure 6 cm and 8 cm. What is the length of the longest side (hypotenuse)? Show your working.

Part 3 of 3

Exit ticket

Quick comprehension check

A right triangle has legs of length 7 cm and 9 cm. What is the length of the hypotenuse? Show your working. A right triangle has a hypotenuse of length 15 m and one leg of length 12 m. What is the length of the other leg? Show your working.

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