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This is the title page for the Introduction to Triangles lesson plan. The main image is of a green triangle with the three angles highlighted in yellow. The triangle is against a blue burst background. The orange Learn Bright logo is at the top of the page.
This is the teachers guide for the Introduction to Triangles lesson plan. The orange Learn Bright logo is at the bottom of the page.
This is the content page for the Introduction to Triangles lesson plan. There are pictures that show triangles in different shapes and sizes. The orange Learn Bright logo is at the bottom of the page.
This is the practice worksheet for the Introduction to Triangles lesson plan. There is a picture of several triangles drawn over each other and colored in different colors. The orange Learn Bright logo is in the upper right corner of the page.
This is the title page for the Introduction to Triangles lesson plan. The main image is of a green triangle with the three angles highlighted in yellow. The triangle is against a blue burst background. The orange Learn Bright logo is at the top of the page.
This is the title page for the Introduction to Triangles lesson plan. The main image is of a green triangle with the three angles highlighted in yellow. The triangle is against a blue burst background. The orange Learn Bright logo is at the top of the page. This is the teachers guide for the Introduction to Triangles lesson plan. The orange Learn Bright logo is at the bottom of the page. This is the content page for the Introduction to Triangles lesson plan. There are pictures that show triangles in different shapes and sizes. The orange Learn Bright logo is at the bottom of the page. This is the practice worksheet for the Introduction to Triangles lesson plan. There is a picture of several triangles drawn over each other and colored in different colors. The orange Learn Bright logo is in the upper right corner of the page.

Introduction to Triangles

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Introduction to Triangles provides a very basic understanding of what makes a shape a triangle. Students will be able to recognize the defining characteristics of triangles and break them down into composite shapes. It is a great starter lesson for introducing young students to this subject.

The “Options for Lesson” section of the classroom procedure page offers extra ideas for fun add-ons to the lesson. One idea is to introduce students to Sierpinski’s triangle and consider printing one of them to color.

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What our Introduction to Triangles lesson plan includes

Lesson Objectives and Overview: Introduction to Triangles introduces students to this iconic shape. Students will learn how to recognize this shape compared to others and discover its defining characteristics. This lesson is for students in 2nd grade.

Classroom Procedure

Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the yellow box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand. For this lesson, you will need cardboard triangle cutouts of various sizes for groups of students.

Options for Lesson

You will find several suggestions for additional ideas and activities in the “Options for Lesson” section of the classroom procedure page. If no pattern blocks are available, have students think of ways to break a triangle into other shapes and draw in the lines. Show students images of artwork with triangles. Introduce students to Sierpinski’s triangle and consider printing one for them to color.

Teacher Notes

The teacher notes page provides an extra paragraph of information to help guide the lesson and remind you what to focus on. The blank lines on this page are available for you to write out thoughts and ideas you have as you prepare the lesson.

INTRODUCTION TO TRIANGLES LESSON PLAN CONTENT PAGE

The Introduction to Triangles lesson plan contains a single content page. It first describes what a triangle is: a closed figure that has three sides and three corners. In math, the corners are called angles. Whether it is upside down or turned a little bit, or what color it is, it doesn’t matter how big or small—a triangle is a triangle if it has three sides and three corners. Triangles are essential because they are one of the most robust shapes. When engineers design bridges, they use triangles because they are so strong. Triangles are used everywhere!

At the bottom of the page, students will learn that they can make triangles out of other shapes. For instance, if they draw a line from opposite corners of a square, they end up with two triangles. The same goes for other shapes too!

INTRODUCTION TO TRIANGLES LESSON PLAN WORKSHEETS

The Introduction to Triangles lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. Each one will reinforce students’ comprehension of lesson material in different ways and help them demonstrate when they learned. Use the guidelines on the classroom procedure page to determine when to distribute each worksheet to the class.

PATTERN BLOCKS ACTIVITY WORKSHEET

For the activity, students will use pattern blocks to create six different triangles. You can show them the answer key for this worksheet as reference if they struggle to make the triangles.

CARDBOARD CUTOUTS PRACTICE WORKSHEET

The practice worksheet requires students to use cardboard cutouts of different-sized triangles to create some fun artwork. They will trace the cutouts and overlap the triangles. After tracing with a black crayon, they will fill in all the shapes in different colors.

INTRODUCTION TO TRIANGLES HOMEWORK ASSIGNMENT

For the homework assignment, students will cut out pictures of shapes and sort them into columns. One column is for the shapes that are triangles. The second column is for shapes that are NOT triangles.

Worksheet Answer Keys

There are answer keys for the practice and homework worksheets at the end of this lesson plan. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.

Additional information

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State Educational Standards

LB.MATH.CONTENT.1.G.A.1, LB.MATH.CONTENT.1.G.A.2

Lessons are aligned to meet the education objectives and goals of most states. For more information on your state objectives, contact your local Board of Education or Department of Education in your state.

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