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Triangles Squares and Games
Rectangles Numbers and Tunes
Weighing Measuring and Fair Division
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already angle arrow auxiliary triangle axis ball Black cent centromeres chess chessboard choose circle of Apollonius circumference closed curve coins colors compute cone connected cube cylinder diagonal distance divide division dodecahedron draw edge equal equilateral triangle faces fraction given gives grains halve hexagon horizontal inches instance intersection knot L. E. J. Brouwer lattice length logarithmic spiral loxodrome lt is easy lt is possible Mathematical mathematical induction maximum rides measuring meridians method Mobius band neighbors nomogram number of moves objects obtain orthodrome pair parallel partners plane players polygon position problem proof proved radius ratio rectangle regular rhombus round rule scale seat segment shape sheet ships shows sides sketch solution specific gravity sphere spiral square Steinhaus straight line surface tent tessellation tetrahedron theorem tickets tion vertex vertices weighing White