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3-4-5 triangle
3 glass puzzle
3 glass puzzle, second, more general tool
T-Junction
Take-Away Games
Tangent Pair
Tangent to two circles
Circle of Similitude
Tangential triangle
Tarski-Banach Decompositions
Taylor circle
Taylor series
Telescoping Series
Ternary number system
Tessellation
Tesseract
Thales' Theorem
Thales' Theorem
The only rational triangle
The Two Men of Tibet Problem
Thébault's Problem I
Thébault's Problem II
Thébault's Problem III
Theorem of Complete Quadrilateral
Theorem of Theaetetus
Thick set
Thin set
Third Proportional
Three pancakes problem
Three 3s
Three 4s
Three 5s
Three Circles and Common Tangents
Three circles problem
Three Tangents Theorem
Three Tangents Theorem
Toads And Frogs Puzzle
Toothpick Construction of a Square
Topological equivalence
Topological Space
Topological transformation
Topology
Torque
Torricelli point">
Torus
Totality (of a binary relation)
Totally ordered set
Tower of Hanoi
Sierpinski Gasket and Tower of Hanoi
Bicolor Towers of Hanoi
Toys and Tots problem
Trachoids
Train wheel quandary
Transcendental numbers
Transfinite Cardinality
Transitive groups
Transitivity in Action
Transivity
Translation Transform
Transpose
of a vector
Transposition
What, how, and the Web
Transversal
Transverse gallop
Trapezoid
Tree
Trefoil knot
Trema
Triangle Classification
Triangle Inequality
, the
Axioms of distance function
Absolute Value of Complex Number
Triangle of Similitude
Triangular Billiard
Triangular numbers
There exist triangular numbers that are also square
Triangulation
Diagonal Triangulation
Trichotomy, the law of
Trigonometric Form of Ceva's Theorem
Trigonometric Form of Complex Numbers
Trilateral Diagrams
Trilinear Coordinates
Trivial Ramsey Number
Tromino
Straight Tromino
Trot
Tucker Circles
Turn
Turning Turtles
Tweedledum & Tweedledee Principle
Twin Circles of Archimedes
Twisted Cord Illusion
Two Butterflies Theorem
Two Butterflies Theorem II
Two coins puzzle
Two Envelopes Paradox
Two Numbers Guessing Game
Two-squares identity
Copyright © 1996-2009
Alexander Bogomolny
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