Circumferences, Diameters, and Radii

Dwayne Belle                   Fuller School
9646 S. Wentworth              4212 S. St. Lawrence
Chicago IL 60628               Chicago IL 60628
(312) 928-6473                 (312) 535-1688

Objectives:

Students will be able to measure circumferences in inches.  
Students will be able to compute radii and diameters, given different 
circumferences.     

Materials Needed:

-blackboard
-notebook paper
-signs
-tape measures
-cans

Strategy:

The strategy will incorporate cooperative learning, and direct teaching 
techniques.  The direct teaching method explains the objectives and how to 
measure the circumference in inches and compute the radii and diameters. 
Cooperative learning encourages the students to interact to formulate the 
correct answers. 

Direct teaching techniques: A short lecture is given on how to measure the 
circumference in inches and compute the radii and diameters.

Cooperative Learning: Students will form three groups.  Each group will be given 
a tape measure and cans.  Each group will try and determine which can has the 
largest circumference, radii and diameter.  Students will compute and compare 
their data.  Next, students will be go to five workstations to measure the 
circumference and compute the radius and diameter of a light pole and four 
different size trees. 

Performance Assessment:

Students will be given twenty objects to compute their circumferences after 
measuring the diameters and radii.