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Demonstrations 61  80 of 346
Sum of Numbers on Invisible Faces
Elementary Chess Endings: Mate in One
Halving the Perimeter of a HeartShaped Curve
Lindgren's Dissection of a Parallelogram to a Parallelogram
Deduce the Net for a Die's Net
Two Dissections of the Letter E to a Square
A TwistHinged Dissection of Triangles
Make Mazes on a Moebius Strip
Dissection of One Quadrilateral to Another
Water Colors Puzzle
Dudeney's Step Dissection of a Rectangle to a Square
Deduce the Net for an Octahedral Die
Simple Caesar Cipher
Two Dissections of a Mitre to a Gnomon
SwingandTwistHinged Dissection of an Octagon to Two Octagons
TwistHinged Dissection of One Pentagon to Four
PianoHinged Dissection of an Ellipse to a Heart
Dissection of a Regular Pentagon into Three Pentagons
Two Dissections of a Mitre to a Square
Dissection of One Triangle to Another
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