## The 2nd Scientific American book of mathematical puzzles & diversions, a new selection |

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### Contents

The Five Platonic Soljds | 18 |

Tetraflexagons | 24 |

Englands | 32 |

Copyright | |

14 other sections not shown

### Common terms and phrases

answer Brown cache called cells CHAPTER chord circle coconuts color column component squares corner crease cube dealer diabolic squares diagonals dice digital root Diophantine disks dissection divided dots doughnut draw Dudeney Dudeney's edge electrical network equal equations exactly example faces finite number five flexagons flexatube folded four golden ratio golden rectangle hypercube Jones letter logarithmic spiral magic square mathematician mathematics Matrix maze mechanical puzzle method monkey move multiple of 9 obtain octahedron odd number Origami paper pattern pencil perfect rectangles perfect square perpendicular Piet Hein plane Platonic solids play player polygon possible probability problem procedure puzzle random readers recreational remaining rotor rule segment shown in Figure simple smallest Smith diagram solids solution solved squared rectangles starter pile structure survival chances tangrams tetrahedron theorem theory tion turn warden