Directions: Drag the green point to appropriate position to measure the diameter of the circle. [br][br]Drag the red point P to straighten and find the circumference. Divide the scale of the ruler to measure its length to [b]two decimal places[/b]. Use the Zoom In, Zoom Out and Move tools if necessary.[br][br]After exploring the tools answer the questions below the circle and ruler tool. [br]
Anthony Or. GeoGebra Institute of Hong Kong.[br]orchiming@gmail.com
Drag the green point to appropriate position to measure the diameter of the circle. What is its diameter?[br][br]Drag the red point P to straighten the circumference. Divide the scale of the ruler to measure its length to [b]two decimal places[/b]. Use the Zoom In, Zoom Out and Move tools if necessary. What is the Circumference?
The Diameter is:[br][br]The Circumference is:
Change the diameter of the circle to 2 cm. What is the Circumference?[br][br]
Change the diameter of the circle to 3 cm. What is the Circumference?
What is circumference ÷ diameter for the 2 cm? What is circumference ÷ diameter for the 3 cm?[br]What do you notice about the answers?