Oppervlakte parallellogram en driehoek

Area of Parallelograms

Drag the red point to change the shape of the parallelogram.[br][b]Is the area of the parallelogram always equal to that of the rectangle? What is the area of the parallelogram?[/b][br]Check the "Dissect" box to explore.
Anthony Or. GeoGebra Institute of Hong Kong.

Circumference of Circles

(See http://www.geogebratube.org/material/show/id/8222 for anothernew version.)[br][br]Drag the green point to appropriate position to measure the diameter of the circle.[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.[br][br]Calculate the values of c/d. What do you discover?
Circumference of Circles
Anthony OR. GeoGebra Institute of Hong Kong.

Area of Circles (adaptation)

Adapted from original applet by Anthony Or, Education Bureau, Hong Kong. (Thank you, Anthony Or!)

Cirkels oefenen

7 types opgaven met cirkelomtrek en -oppervlakte oefenen.

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