Value Of Pi

Learning Outcomes

1. Use direct or indirect measurements and describe the relationships among radius, diameter, and circumference of circles
2. Investigate different circumference of circles and compare them with their respective diameter and relate circumference to Pi.
3. Use direct or indirect methods to find the circumference of circle, semicircle.
4. Develop and apply the formula and find the area of a circle and semicircle.

Description Of Activity

How to play

1. Teachers asks children to make 3 or 4 groups.
2. Each Group is asked to go to a Basketball Court, Football Ground or a Flag Posts which have circular shapes.
3. They are asked to measure the circumference and diameters of the circle and note down.
4. They can measure using scale, rope or whatever method they want to adopt.
5. They are asked to compute ratio of Circumference over Diameter.
6. All groups will then declare the results they have got.
7. Children will learn how to arrive at the approximate value of by using measurable dimensions and learn that.
8. Circumference /diameter =22/7 for any size circle =  (which is constant)

A  student will get a clear idea  by the definition of and why it takes the value 22/7.

Variations

They can be encouraged to try out by measuring circles of different sizes. They can be given home assignment to look at dimensions from different sports (Football, Hockey, Basketball, Netball etc.) and note down circumference, radius, diameter and ratios. 

Coaching Tips

1. In case the markings are not there on the ground, encourage children to make circle markings on the ground using their chosen methods. They would learn how to draw circles.
2. You can encourage children to calculate Area of the circles. Instead of the word “circumference”, teacher may use the term “perimeter” to show that they mean the same.

Equipment/Material Required

Measuring Tape, Rope, Scale etc. (which groups will want to use).