2S4.3 電子幾何條 Electronic Geo-Strips

相關工作紙及教育局「網上學與教支援」資源(中文版)

中文版:http://www.geogebratube.org/material/show/id/578 (Download GeoGebra file)

利用軟件回答下列問題。
1. 你是否能夠做出一個邊長為2 cm、3 cm、3 cm 及 9 cm的四邊形?為什麼?
2. 若四邊形的四邊相等,它可以是什麼形狀?
3. 若四邊形的兩對對邊相等,它可以是什麼形狀?
4. 若四邊形的兩對鄰邊相等,它是什麼形狀?
5. 做出(由上至下)分別為下列邊長的梯形:
  (a) 4 cm, 4 cm, 4 cm, 6 cm;
  (b) 4 cm, 4 cm, 5 cm, 6 cm; 
  (c) 4 cm, 3 cm, 5 cm, 7 cm;
  (d) 3 cm, 3 cm, 5 cm, 7 cm。
  梯形有什麼特性?

English versionhttp://www.geogebratube.org/material/show/id/470 (Download GeoGebra file)

Answer the following questions using the applet.
1. Can you make a quadrilateral of four sides being 2 cm, 3 cm, 3 cm and 9 cm? Why or why not?
2. If a quadrilateral has four equal sides, what are its possible shapes?
3. If a quadrilateral has two pairs of equal opposite sides, what are its possible shapes?
4. If a quadrilateral has two pairs of equal adjacent sides, what is its shape?
5. Make the trapezium of the four sides (from top to bottom) being:   
      (a) 4 cm, 4 cm, 4 cm, 6 cm;  (b) 4 cm, 4 cm, 5 cm, 6 cm;  (c) 4 cm, 3 cm, 5 cm, 7 cm;  (d) 3 cm, 3 cm, 5 cm, 7 cm.    
      What is the characteristic of trapeziums?