Education Technology

# Activities

• ##### Subject Area

• Math: Geometry: Circles

6-8

20 Minutes

• ##### Device
• TI-73 Explorer™
• TI-Navigator™
• ##### Other Materials
• DiameterCircumference.act

• Measuring tapes (customary and metric units)
• String (optional)
• Variety of objects with a circular section (soda can, garbage can, top of stool, etc.), access to at least one object that it is difficult to measure either the circumference or diameter (such as a round building column or center circle on a basketball court)

## Circles All Around

#### Activity Overview

This activity provides students an opportunity to explore the relationship between the diameter of a circle and its circumference

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• #### During the Activity

Students will:

• Apply appropriate techniques, tools, and formulas to determine measurements
• Solve problems involving scale factors, using ratio and proportion
• #### After the Activity

Review student answers:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary