IM: 7.3.3: Exploring Circumference (Lesson)

By Newsela Staff

Last updated 6 days ago

5 Questions

3.1: Which is Greater?

Clare wonders if the height of the toilet paper tube or the distance around the tube is greater. What information would she need in order to solve the problem? How could she find this out?

3.2: Measuring Circumference and Diameter

Your teacher will give you several circular objects.

Explore the applet to find the diameter and the circumference of three circular objects to the nearest tenth of a unit.

https://curriculum.illustrativemathematics.org/MS/students/2/3/3/index.html

[Scroll to the tool under "3.2 Measuring Circumference and Diameter"]

Record your measurements in the table.

Plot the diameter and circumference values from the table on the coordinate plane.

What do you notice?

Plot the points from two other groups on the same coordinate plane.

Do you see the same pattern that you noticed earlier?

3.3: Calculating Circumference and Diameter

Here are five circles. One measurement for each circle is given in the table.

Use the constant of proportionality estimated in the previous activity to complete the table.

Are you ready for more?

The circumference of Earth is approximately 40,000 km. If you made a circle of wire around the globe, that is only 10 meters (0.01 km) longer than the circumference of the globe, could a flea, a mouse, or even a person creep under it?