Lesson Planet
Search educational resources
  • Sign In Try It Free
  • AI Teacher Tools
    • Discover Resources Search reviewed educational resources by keyword, subject, grade, type, and more
    • Curriculum Manager (My Content) Manage saved and uploaded resources and folders To Access the Curriculum Manager Sign In or Join Now
    • Browse Resource Directory Browse educational resources by subject and topic
    • Curriculum Calendar Explore curriculum resources by date
    • Lesson Planning Articles Timely and inspiring teaching ideas that you can apply in your classroom
    • Our Story
    • Frequently Asked Questions
    • Testimonials
    • Contact Us
  • 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

Hi, what do you want to do?

Create a lesson plan
Create a lesson plan
Generate resources with 80+ AI teacher tools
Generate resources with 80+ AI teacher tools
Search 200,000 instructional videos
Search 200,000 instructional videos
Find a teaching resource
Find a teaching resource
Triangles Lesson PlanTriangles Lesson Plan
Publisher
Curated OER
Curator Rating
Educator Rating
Not yet Rated
Lesson Plan

Triangles

Curated and Reviewed by Lesson Planet

Third graders recognize geometric shapes with acute angles, make geometric shapes with acute angles on geoboards, and draw acute angles on geopaper.

5 Views 14 Downloads
Concepts

triangles

Additional Tags

triangles, math
Show More Show Less

Resource Details

Grade
3rd
Subjects
Math
2 more...
Resource Type
Lesson Plans
Audience
For Teacher Use
Instructional Strategies
Skills Practice
1 more...
Year
2002

See similar resources:

Lesson Plan

Geometric Shapes

Curated OER
Connect geometric shapes to your learners' lives with this worksheet. In order to complete this worksheet, young scholars must discover examples of triangles, squares, and circles at school, at home, and outdoors and list them on a...
1st - 3rd Math
Worksheet

Sorting 2-Dimensional Shapes

Curated OER
Explore shape attributes with young geometers as they sort nine shapes based on their corners. Scholars determine whether or not each shape has a square corner, drawing it in the appropriate space accordingly. They are encouraged to use...
2nd - 3rd Math
CCSS: Designed
Worksheet

Area of Right-Angled Triangles

Curated OER
There's a trick to solving the area of a triangle, and it involves a skill your geometers have already mastered. Help them discover the connection between finding a rectangle's area and finding a right triangle's area as they solve for...
3rd - 5th Math
CCSS: Designed
Printables

2-D Shape Cards

K-5 Math Teaching Resources
Add some visual support to your elementary geometry lessons with this set of printable shape cards. From triangles and squares to octagons and nanogons, this simple resource can be used in countless ways to develop children's knowledge...
K - 5th Math
CCSS: Adaptable
Lesson Plan

Lines of Symmetry for Triangles

Illustrative Mathematics
What can symmetry tell us about triangles? After looking at four examples, learners will come to realize that lines of symmetry are different for equilateral, isosceles, and scalene triangles. Use this guided practice activity as an...
3rd - 5th Math
CCSS: Designed
Lesson Plan

What Shape Am I?

Illustrative Mathematics
Sharpen your pencil and grab a ruler, it's time to draw some quadrilaterals! Given the definition of a parallelogram, rectangle, and rhombus, learners draw examples and nonexamples of each figure. The three definitions are...
3rd - 5th Math
CCSS: Designed
Lesson Plan

Shape Up!

Curated OER
An outstanding lesson plan on teaching the basic shapes and polygon names to young geometers is here for you. In it, learners investigate the role of basic polygons in the strength of structures. They use geoboards, rubber bands,...
2nd - 3rd Math
Worksheet

Shapes on a Plane

K12 Reader
Geometric shapes are the focus of a comprehension exercise that asks readers to examine a short passage about planes, circles, triangles, and rectangles, and then to respond to a series of questions about the article.
2nd - 3rd Math
CCSS: Designed
App

The Land of Venn - Geometric Defense

iMagine Machine
Young mathematicians use their geometry skills to save the Land of Venn in an engaging math game. A fun way to reinforce children's understanding of basic geometric figures and shapes.
2nd - 5th Math
CCSS: Adaptable
Lesson Plan

Shaping Up With Picasso

Curated OER
Students examine the artwork of Pablo Picasso and describe geometric shapes they observe. After observing geometric pictures and other objects, students create replicas of them using geometric shapes. Using a watercolor wash, students...
1st - 12th Math
Try It Free
© 1999-2026 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 Content
Contact Us Site Map Privacy Policy Terms of Use