# Lesson from the web

During a two week summer session at Bryn Mawr College, Philadelphia public school teachers were introduced to the internet. During this two week session they were introduced to many things. Some of these things were fractals, testallation and the serpinski triangle. As part of the final assignment, we were to write a lesson plan and somehow tie it to the web.
Nora, Leon and I will present a lesson to to you on Pi. This is a math lesson for students in grades 7-8. Our connection to the internet is that of getting our lesson from a math web site. These sites are very interesting as well as helpful. Some of those sites are very specific. We found one of the most interesting sites to be THE MATH ARCHIVES. The web address is http://archives.math. utk.edu/k12.html. The Math Archives contained K-12 Teaching Materials from different web sites.

There are a number of other similar sites
The following are Internet sites which contain a wide variety of materials which can be used in the teaching of mathematics at the K-12 level. The materials were organized into the following categories:

1. Lesson Plans

2. Schools

3. Software

4. Other internnet sites

Lesson plans are from five different sites . These sites include:

1. AskERIC Lesson Plans

2. Big Sky Telegraph Math Lesson Plans

3. Columbia Education Center

4. Mathematics Lesson Plans and

5. Computers & Maths Teaching
We would like to present a lesson to you that we down loaded from Columbia Education Center. Nora will continue our presentaion with a lesson.
b. Lesson
TITLE: Discovering Pi
AUTHOR: Jack Eckley, Sunset Elem., Cody, WY
GRADE LEVEL/SUBJECT: 5-7, geometry

OVERVIEW: Many students tend to memorize, without
understanding, formulas that we use in geometry or other
mathematic areas. This particular activity allows students
to discover why pi works in solving problems dealing with
finding circumference.

OBJECTIVES: The students will:

1. Measure the circumference of an object to the nearest
millimeter.

2. Measure the diameter of an object to the nearest
millimeter.

3. Explain how the number 3.14 for pi was determined.

4. Demonstrate that by dividing the circumference of an
object by its diameter you end up with pi.

5. Discover the formula for finding circumference using
pi, and demonstrate it.

RESOURCES/MATERIALS: round objects such as jars, lids,
etc., measuring tapes, or string and rulers, paper, pencil,
calculator

ACTIVITIES AND PROCEDURES:

1. Divide class into groups of two.

2. Give materials to student teams.

3. Have student teams make a table or chart that shows
name or number of object, circumference, diameter,
and ?.

4. Have students measure and record each object's
circumference and diameter, then divide the
circumference by the diameter and record result in
the ? column.

5. Have students find the average for the ? column and
compare to other groups in the class to determine a
pattern. Students can then find the average number
for the class.

6. Explain to the students that they have just discovered
pi, which is very important in finding the
circumference of an object. (You may wish to give
some historical information about pi at this time or
have students research the information.)

7. Have students come up with a formula to find the
circumference of an object knowing only the diameter
of that object, and the number that represents pi.
Students must prove their formula works by
demonstration and measuring to check their results.

HOMEWORK:

1. Have students write their conclusions for the
activities they have just done. Students may also
share what they have learned with other members of the
class.

2. Give students three problems listing only the diameter
of each object and have them find the circumference.

3. Encourage students to share learned knowledge with
parents.
Leon will finish our presentaion by answering your questions.
Leon Bailey
Nora Kasper
Lloyd L. Norman