Circumference Of A Circle  by  Alice Akinyi

6

### CIRCUMFERENCE

What is circumference?

It's the distance a round a circular object (circle)

A CIRCLE

• Identify the circumference

Other examples include ;

(a) A ring

(b) A wheel

A bicycle  wheel and A car wheel.

• Kenyan coin

( d) An Orange and lid

(e) Clock

• Observe the seconds hand of

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### DIAMETER

What is diameter?

Its the distance around the circumference across the center of the circle
It divides the circle into two equal halves

The relationship between diameter and circumference

• Use a string to measure

Relationship between diameter and circumference

Fit the diameter around the Circumference

The length of the diameter fits the circumference 3 1/7

• It's the distance from the center of the diameter to  the circumference
• It divides the diameter into  two  equal halves

Relationship between the radius and the circumference

Circumference   =   2radius (2r) × pi

ACTIVITIES

Measure and record circumference and diameters of different objects and complete the table

 Object Circumference Diameter Radius Circumference ____________ Diameter        = (C/D) Shoe lid Coin Bottle top Orange Ball Glass

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