利用1 cm² 的正方形鋪滿不同大小的長方形和正方形，探討長方形
和正方形的面積和邊長的關係。

中文版:  http://www.geogebratube.org/material/show/id/16657 (Download GeoGebra file)

相關工作紙及教育局「網上學與教支援」資源（中文版） 

點擊圖形內的空白位置，找出各圖形的面積。

長方各的面積和它的長和闊有甚麼關係？

Explore the formula for the area of a rectangle by tessellating 

its space using unit squares.

Eng ver: http://www.geogebratube.org/material/show/id/16621 (Download GeoGebra file)

Find the area of each of the following rectangles or squares by clicking the empty spaces inside.

What is the relationship between the area of a rectangle and its length and width?