You need to install ActiveX plug-in to be able to view this model.
This model illustrates the figure area determination process for a triangle, a trapezoid, and a parallelogram.
Choose a figure by using the CHOICE button. The figure shape may be chosen by a mouse. The problem is to cut the figure by using the minimal cut number, and then to combine a rectangle from the formed parts. In so doing, the area of the rectangle equals that of the initial figure.
By choosing the DEMO mode, you can watch the motion video including the solution of the problem.
The CONSTRUCT mode provides independent cutting and solving. You can check if the construction correct.
If the construction of a rectangle is correct, the program calculates automatically its area from a number of closed cells.
You can download it here.