# PERIMETER OF RECTANGLES, SQUARES AND TRIANGLES

## 📖Standard

CCSS.MATH.CONTENT.3.MD.D.8 Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.

CCSS.MATH.CONTENT.4.MD.A.3 Apply the area and perimeter formulas for rectangles in real world and mathematical problems.

## ⏰LESSON TIME

30 minutes without gameplay, 45 minutes with gameplay

## 📃 SUMMARY

In this lesson plan, students will learn how to compute perimeter, apply those skills in game-based practice problems and solve perimeter problems using an interactive web-based activity with virtual manipulatives.

## 📚 Lesson Plan

### 1. Video: How to Find the Perimeter and Polygons

Watch this animated video that explains how to find the perimeter of different polygons, including rectangles, triangles and squares. (3:00)

### 2. INSTRUCTIONAL ACTIVITY WITH ASSESSMENT: Interactive perimeter problems activity

This digital activity walks students through calculating the perimeter of different shapes including a rectangle, a square and a circle in a narrative-driven context around the farm and integrates virtual manipulatives. Students are provided in-activity instruction as they are presented with and explained the formulas to use when they need to use them. Additionally, with in-activity scaffolding, students can “get a hint” on each problem.

You may elect to read and work through it during class time, giving students time to complete the problems or assign it as an individual assignment.

If your students have not used virtual manipulatives with Google slides previously, here is a 30-second introduction.

Estimated time to complete: 20-25 minutes

### 3. GAME: Making Camp Premium or Spirit Lake

Have students play Making Camp Premium games for 15-20 minutes (remainder of the lesson time) specifically including these icons.

Perimeter is also covered in the second half of Spirit Lake: The Game.

## Assessment

In addition to the virtual manipulative activity above,  remember that you can always see your students’ performance on the problems in Making Camp Premium and Spirit Lake by accessing the reports page. You will need to enter the password you received during training.

### State Standards

Minnesota Math Standard 3.3.2.2 – Find the perimeter of a polygon by adding the lengths of the sides.

Minnesota Math Standard 3.3.2.3 – Measure distances around objects.

### Related Lesson

“PERIMETER OF RECTANGLES, SQUARES AND TRIANGLES (Bilingual English & Spanish)” – The Bilingual version of the lesson plan above with English and Spanish resources.