Education Technology

# Activities

## Circle Around

#### Activity Overview

Students compute the circumference and area of circles. They understand that the ratio of the circumference to the diameter is a value (3.14) called pi.

#### Before the Activity

• Review the relation between circumference and area of circles
• See the attached PDF file for detailed instructions for this activity
• Print pages 104 - 106 from the attached Student PDF file for the class
• #### During the Activity

Distribute the pages to the class.

• Use formulas to compute the circumference and area of circles with a given radius or diameter value
• Determine the radius [to the nearest cm] of circles whose circumference or area is given
• Examine the diameters of the concentric circles of the archer's target, and determine the areas of the bull's eye and the area of the circle formed by the outermost ring
• Calculate the total area of all the shaded rings
• Determine what proportion of the area of the target forms the bull's-eye
• Determine what proportion of the area of the target is shaded and not shaded
• #### After the Activity

Students complete the activity pages and answer questions.

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