Lesson Plans & Worksheets Reviewed by Teachers

Search educational resources

Search

Menu

Sign In Try It Free
Discover
Solutions
- Educator Edition Save time lesson planning by exploring our library of educator reviews to over 550,000 open educational resources (OER).
- Learning Explorer An all-in-one learning object repository and curriculum management platform that combines Lesson Planet’s library of educator-reviews to open educational resources with district materials and district-licensed publisher content.
About
Pricing
School Access
- Your school or district can sign up for Lesson Planet — with no cost to teachers
  Learn More
Sign In
Try It Free

Create engaging lessons with

vetted educational resources— videos, interactives, games, lesson ideas, and more!

Start Your 10-Day Free Trial

NEW! AI Teacher Tools

AI Teacher Tools have landed!

Generate lesson ideas & resources that meet your needs, then edit and add to a lesson collection.

Note: AI generated content can sometimes include bias and inaccuracies; always vet content before sharing with students and follow school policies.

+

Lesson Plan

Group Isomorphisms Lesson Plan

Curated OER

Group Isomorphisms

For Teachers 9th - 10th

Students identify and apply properties of triangles. In this geometry instructional activity, students define equilateral triangles by sides and angles. They build cardboard triangles as they study properties of triangles.

Get Free Access See Review

© 1999-2024 Learning Explorer, Inc.

Teacher Lesson Plans, Worksheets and Resources

Sign up for the Lesson Planet Monthly Newsletter

Open Educational Resources (OER)

Health
Language Arts
Languages
Math
Physical Education

Science
Social Studies
Special Education
Visual and Performing Arts

View All Lesson Plans

Discover Resources

Our Review Process
How it Works
How to Search
Create a Collection

Manage Curriculum

Edit a Collection
Assign to Students
Manage My Resources

Contact Us Site Map Privacy Policy Terms of Use