Hinged Square & Other Puzzles

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.Moscovich, Ivan is the author of 'Hinged Square & Other Puzzles', published 2004 under ISBN 9781402716669 and ISBN 1402716664.