Classifying Quadrilaterals by Four Sides

Answer the following questions using the applet.
1.　Can you make a quadrilateral of 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 pair of equal opposite sides, what are its possible shapes?
4.　If a quadrilateral has two pair 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?

Anthony Or, Education Bureau, Hong Kong.

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