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# Perimeter of Irregular Rectilinear Shapes

Lesson 2 of 37

## Objective: SWBAT find the perimeter of rectilinear shapes by determining and summing the lengths of all sides

*40 minutes*

#### Introduction

*10 min*

I will cold call students on questions about the previous day. What measurements did we find? Define those measurements. What part of the bumper car track represented the perimeter? What part represented the area? I will then say today we will only be focused on perimeter. I will show students the exit ticket so they can see the criteria for success.

I will then introduce the example problem. Before going over the steps, I will ask students to discuss the essential question. With the example I will ask students to identify what information is missing and how can we determine the missing information. Specifically, as all shapes are rectilinear, how can we use the properties of rectangles to help find the lengths of missing sides? This gives students a chance to make sense of the problem (**MP1) **before I provide steps. Use language about rectangles to justify their answers gives students a chance to practice precision in their language (**MP6). **I will then see if students can fill in the missing blanks of the steps before providing them. I will then use the steps to model how to find the perimeter.

#### Resources

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#### Guided Practice

*5 min*

Students will use the example problem, steps, and their neighbors as a resource. I will insist on students using these resources before asking me for help.

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#### Independent Practice

*15 min*

Once it is clear the majority have successfully solved the problem, students will begin working independently.

I will only provide intervention to those students that struggled with the guided practice. Otherwise, I will remind students to use their notes.

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We will briefly go over solutions as needed. If there are major difficulties I will have the class transfer the image to graph paper. Students will then take the exit ticket.

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- LESSON 1: Explore Perimeter and Area of Composite Shapes
- LESSON 2: Perimeter of Irregular Rectilinear Shapes
- LESSON 3: Area of Composite Shapes Using a Grid
- LESSON 4: Area of Composite Shapes
- LESSON 5: Area of Regions Formed by Inscribed Shapes
- LESSON 6: CORNERSTONE:Circle Ratios: Diameter to Radius; Circumference to Diameter
- LESSON 7: CORNERSTONE: Circumference Formula
- LESSON 8: Area of a Circle
- LESSON 9: Circumference & Area Fluency Practice
- LESSON 10: Finding the Radius From a Given Circumference or Area
- LESSON 11: Circumference from Area / Area from Circumference
- LESSON 12: Circle Designs: Finding the Area and Perimeter of Shapes Composed of Arcs and Line Segments
- LESSON 13: Assessment_Area and Perimeter (Circumference) of Composite Shapes and Circles
- LESSON 14: Drawing Prisms & Pyramids
- LESSON 15: Describe Prisms and Pyramids Using Algebra
- LESSON 16: Using Nets to Find the Surface Area of Prisms
- LESSON 17: Using a Formula to Find the Surface Area of Prisms
- LESSON 18: Finding the surface area of triangular prisms using a net
- LESSON 19: Finding the Surface Area of a Triangular Prism Using A Formula
- LESSON 20: Discovering the Formula for the Surface Area of A Cylinder
- LESSON 21: Finding the Surface Area of Cylinders Using a Formula
- LESSON 22: Practice Day: Surface Area of Prisms & Cylinders
- LESSON 23: Surface Area of Prisms and Cylinders Assessment
- LESSON 24: Finding the Surface Area of Pyramids Using Nets
- LESSON 25: Finding the Surface Area of Pyramids Using a Formula
- LESSON 26: Surface Area of Composite Shapes
- LESSON 27: Surface Area of Composite Shapes With Holes
- LESSON 28: Surface Area Assessment
- LESSON 29: 3-D Models from 2-D Views
- LESSON 30: Exploring Volume and Surface Area with Unifix Cubes
- LESSON 31: Explore Volume of Rectangular Prisms
- LESSON 32: Find the Volume of Prisms Using a Formula
- LESSON 33: Volume Of Cylinders Using a Formula
- LESSON 34: Volume of Composite Shapes
- LESSON 35: Volume and Surface Area - Accelerated Math Fluency Day
- LESSON 36: Volume of Pyramids
- LESSON 37: Surface Area and Volume Final Assessment