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.
Follow the activity procedures:
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