Area and Circumference of Circles

Introduction

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• As a hook, ask students how the area and circumference of circle might be important for designing amusement park rides. Refer to the last page of the guided notes as well as the FAQs below for ideas.
• Use the guided notes to introduce the concept of pi, and formulas of the area and circumference of circles. Refer to the FAQ below for a walk through on this, as well as ideas on how to respond to common student questions.
• Walk through the key points of finding the area and circumference of circles, including understanding the relationship between the radius, diameter, and circumference of circles. In this lesson, students as asked to use 3.14 for pi, but are explained that pi is a never ending irrational number.

Check for Understanding

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• Have students work through the problems on the check for understanding page, either collaboratively or independently.
• Walk around and spot-check student answers on the check for understanding activity.
• Based on student responses, reteach concepts that students need extra help with. If your class has a wide range of proficiency levels, you can pull out students for reteaching, and have more advanced students begin work on the practice exercises.

Practice

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• Have students practice finding the area, circumference, diameter, radius of circles using the maze activity. Walk around to answer student questions.
• Fast finishers can dive into the Doodle Math activity for extra practice. You can assign it as homework for the remainder of the class.

Real-Life Application

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• Bring the class back together, and introduce the concept of circles in amusement park rides. Explain that understanding the area and circumference of circles is essential for designing and building these rides, ensuring they are both thrilling and safe for riders.
• Refer to the FAQs for more ideas on how to teach the real-life application of circles in amusement park rides.

Real-Life Application Project

Ask students to brainstorm different types of amusement park rides that involve circles. Examples might include Ferris wheels, roller coasters, and spinning rides.

Have students work in small groups to design their own amusement park ride that involves circles. They should consider the area and circumference of circles in their design. After they have completed their designs, have each group present their ride to the class, explaining how they used the concepts of area and circumference to create their ride.

Additional Print Practice (Doodle Math)

A fun, no-prep way to practice area and circumference of circles is Doodle Math — it's a fresh take on color by number or color by code. It includes 3 levels of practice, and there’s one that’s perfect for St. Patrick’s Day or any time of year.

Challenge with Composite Figures (Pixel Art Google Sheets)

If you’re looking for a digital extension covering composite figures, try my Pixel Art activities in Google Sheets. They’re self checking, and perfectly themed for Valentine’s Day or Pi Day.