Figure-Four Rabbit Trap (p. 172)
xxxxxAn exercise on measuring and working from a scale drawing. Also, an application of the fact that the triangle is the only rigid polygon.
xxxxxA ruler, three sticks 20, 25, and 40 centimeters long, a knife with which to notch the sticks, and a box large enough and strong enough to hold a rabbit. A good source for the sticks is kite struts.
Math Games & Activities, Vol. 2