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# Triangles, Triangles, Triangles

Lesson 7 of 10

## Objective: SWBAT identify ways to create a triangle using different combinations of shape blocks.

#### Setting up the Learning

*5 min*

**CCSS Context:**

In this lesson, students work on an incredibly important shape in geometry-the triangle. This lesson has students think about different ways to create composite triangles in a variety of ways, which is aligned to 1.G.A2. Through the process of practicing how to make the triangle, they also practice making other composite shapes, particularly the trapezoid and rhombus. This is a complex task, as it asks for students to show more than one correct answer. One of the key shifts in the CCSS is an emphasis on high quality, complex tasks at all grade levels.

**Review:**

We have been learning about shapes and thinking about how they fit together. Today we are going to think about one of the most important shapes: the triangle.

**Connect:**

Triangles are very important because they are one of the strongest shapes. When engineers design bridges, they often use triangles because they are so strong.

*I'll have students look carefully of this bridge image to see if they can find the triangles.*

**Objective: **Your thinking job is: How can I build a triangle using other shapes?

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#### Student Share

*15 min*

**Student Work Time:**

This will probably take some time! If students find one way, see if they can find a different way to make a triangle or push them to try to record how they did it.

Bring students back together after 10(ish) minutes of work time for a share out.

**Student Share: **Call on students to explain the different ways they made the shape.

**Technology Connection: **I am using the online Illuminations tool so kids can see how other students built the hexagon.

To push students to use visualization to put these shapes together, I'll show all of the shapes a child used to make a triangle without actually putting them together yet.

**Partner Talk: Try to predict how they used these shapes to put it together.**

I'll show how the student put the shapes together. Then I'll model representing it on the triangle anchor chart and write words to explain what shapes to use (I used 1 triangle, 1 rhombus and 2 trapezoids).

I'll follow this same routine for a few other ways of representing.

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#### Independent Practice

*15 min*

I used the template provided by the website prekinders.com. It is available as a free pdf on their website! Go here to get this great resource!

Students work to find as many ways as possible to build a triangle. See attached picture for one student's work! Ways to Make Triangles

**Extension**: Students work off the template and make a triangle without picture support.

#### Resources

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- UNIT 1: Creating a Culture of Math
- UNIT 2: Count to 100 Every Day!
- UNIT 3: 10: A First Grader's Best Friend
- UNIT 4: Charting and Analyzing Data
- UNIT 5: Inch by Inch, Paperclip by Paperclip
- UNIT 6: Properties of Addition and Subtraction
- UNIT 7: Shapes and Blocks
- UNIT 8: Understanding Equality
- UNIT 9: Adding and Subtracting: Base Ten
- UNIT 10: Solving 3 Addend Problems
- UNIT 11: Missing Parts: Unknowns in All Positions
- UNIT 12: Parts of a Whole
- UNIT 13: Tick Tock, Tick Tock
- UNIT 14: Time is Money: Hitting all the MD Standards
- UNIT 15: Base 10 Bonanza
- UNIT 16: What the WHAT?! Teaching Challenging Story Problems

- LESSON 1: Prove it!
- LESSON 2: What's your rule?
- LESSON 3: Riddle Me This
- LESSON 4: More Ways Than One
- LESSON 5: More and Fewer: Ways to Make
- LESSON 6: Ways to Make: Hexagon Edition
- LESSON 7: Triangles, Triangles, Triangles
- LESSON 8: Here are the 3D Shapes That I Know
- LESSON 9: Boxes and Blocks
- LESSON 10: Building Santa's Workshop