Αντιγραφή του Area of Parallelograms (GeoGebra 4 version)
[b](18 Dec 2013 updated)[/b]
Explore the area of parallelograms [b]of different shapes[/b], including [b]"skewed"[/b] ones.
Anthony Or.
GeoGebra Institute of Hong Kong.
（繁體中文版：http://www.geogebratube.org/material/show/id/803）
