Classifying Triangles by Angles & Sides

Introduction

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As a hook, ask students why understanding the different types of triangles might be useful in real life situations. Refer to the last page of the guided notes titled "Real-life application" for ideas on how to link triangle classification to practical scenarios.

Use the first page of the guided notes to introduce the concept of classifying triangles by their sides (equilateral, isosceles, scalene triangles). Walk through the definitions of each type of triangle, emphasizing the key characteristics that differentiate them. Refer to the FAQ below for a walk-through on this topic, as well as ideas on how to respond to common student questions.

Proceed to use the second page of the guided notes to introduce classifying triangles by their angles (acute, obtuse, right triangles). Explain the definitions of each type of triangle based on angle measurements, highlighting how to identify them visually. Refer to the FAQ below for guidance on teaching this section effectively and addressing any student inquiries.

Based on the students' responses during the introduction and initial explanation, reteach any concepts that students may need additional help understanding. If there is a wide range of proficiency levels in the class, consider pulling out students for reteaching while more advanced students begin working on the upcoming practice exercises.

Practice

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Have students practice classifying triangles by sides and angles using the practice worksheet included in the resource. Students can start with the maze activity (pg. 3 of guided notes) to practice classifying triangles to escape the maze. Walk around to answer student questions.

Then, fast finishers can start the color by code activity (pg. 4 of guided notes) for extra practice. You can assign it as homework for the remainder of the class.

Real-Life Application

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Using the last page of the guided notes, bring the class back together, and introduce the concept of using triangles in architecture and construction. Triangles are essential in constructing stable and sturdy structures like bridges, buildings, and even roller coasters. Discuss with students how architects and engineers use their knowledge of different types of triangles to design and build safe and reliable structures. Students will read about the real life applications and reflect on a short prompt as well as complete a self assessment on their confidence level on this math topic.

Refer to the FAQ for more ideas on how to teach it!

Additional Self-Checking Digital Practice

If you're looking for digital practice for Classifying Triangles by Angles & Sides, try my Pixel Art activities in Google Sheets. Every answer is automatically checked, and correct answers unlock parts of a mystery picture. It’s incredibly fun and a powerful tool for differentiation.

Here is an activity to explore:

• Classifying Triangles by Sides and Angles Digital Pixel Art

Additional Print Practice

A fun, no-prep way to practice Classifying Triangles by Angles & Sides is Doodle Math — they’re a fresh take on color by number or color by code. It includes multiple levels of practice, perfect for a review day or sub plan.

Here are 1 activity to try:

• Classifying Triangles | Doodle Math: Twist on Color by Number Worksheets