# Circumference of Circles (New)

Drag the green point to appropriate position to measure the diameter of the circle. What is its diameter?
Drag the red point P to straighten the circumference. Divide the scale of the ruler to measure its length to

**two decimal places**. Use the Zoom In, Zoom Out and Move tools if necessary. Change the diameter of the circle to 2 cm, 3cm, or any other diameters. Calculate the value of: circumference ÷ diameter. What do you observe?Anthony Or. GeoGebra Institute of Hong Kong.
orchiming@gmail.com

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