Lesson plan

# Find the circumference of a circle by using the area

teaches Common Core State Standards CCSS.Math.Content.7.G.B.4 http://corestandards.org/Math/Content/7/G/B/4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

## You have saved this lesson plan!

Here's where you can access your saved items.

Dismiss

### Sign up or log in to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson plan.

Big Ideas: The formula for the circumference of a circle is related to the formula for the area of a circle. Therefore, the circumference and radius can be used to calculate the area and vice versa. This lesson builds on students' understanding of how to find the area and circumference of a circle. The task engages students in using the area of a circle to find the circumference in order to solve a real world problem. George, a fisherman, is renting a boat and needs to decide which boat is the best deal. The total cost of the boat depends on the total distance traveled. Students need to calculate the circumference of the lake in order to choose which boat to rent. Vocabulary: radius, diameter, circumference, area, pi Special Materials: None