Free Download Ivan Moscovich, "The Hinged Square & Other Puzzles "
English | ISBN: 1402716664 | 2004 | 128 pages | PDF | 11 MB
A colorful square, dissected into four parts, with hinges marked in black. If you leave the blue piece fixed and swing the others around their hinges, a new shape will emerge. Can you guess just by looking what it will be? This is just one of the tricky geometrical gems that will make a puzzler's mind work overtime. Try drawing a set of variously shaped polygons using only a compass and a ruler (no measuring allowed!), figuring out which of two sculptures is bigger (logic alone won't give you the answer), and lots more.
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