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This is a strange one. The program draws a line on the screen and you are invited to guess its length in centimeters. Obviously the true length of the line will depend on the type of display you are using�even worse if you're using an emulator with resizable windows! There are instructions in the flyer for calibrating the program so that the measurements are accurate.

When you get tired of guessing lengths, you can try your hand at guessing the area of a random rectangle.