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Month: September 2020

Posted on September 26, 2020

Four Constants in Four 4’s

The infamous problem of representing numbers with four 4’s appeared for the first time in 1881 in a London science journal. In 2001, a team of mathematicians from Harvey Mudd College found that we can even get four 4’s to approximate four notable constants: the number e, π, acceleration of gravity, and Avogadro’s number.

4 constants with four 4s

Posted on September 12, 2020

Six Points on a Circle

Take 6 points on a circle such that every second edge (green chords) has length equal to the radius of the circle. Then the midpoints of the other three sides of the cyclic hexagon form an equilateral triangle.six point triangle

Read more: https://www.archimedes-lab.org/2-Sunday_puzzle_43.html

Posted on September 11, 2020

Geometric Passe-muraille

A 3D regular hexahedron solid (cube) passing through a 2D plane:Cube through plane

Posted on September 9, 2020September 9, 2020

Isogonic Center

In geometry, the isogonic center (aka Fermat–Torricelli point) of a triangle, is a point such that the total distance from the three vertices of the triangle to the point is the minimum possible.

isogonic center

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About Archimedes Lab

Mental activities and tutorials that enhance critical and creative thinking skills.

We provide compelling educational and entertaining content to book and magazine publishers. We also invent and develop thinking games and visual material for recreational, cultural or advertising use.

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  • Archimedes’ turbine January 4, 2021
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  • Shortest Path on a Cube December 27, 2020
  • The Paradox of Infinity December 25, 2020
  • Magic Inscribed Lotus December 20, 2020
  • A Paradoxical Zero-Length Hypotenuse December 18, 2020
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Our Recent Educational Books

Fantastic Optical illusions
illusion playing cards
Fantastic Optical Illusions
ISBN 178739235X
Illusion d'Optique playing card deck
Optical illusions
You can't possibly color this
Optical Illusions
ISBN 1682973395
You can't possibly color this!
ISBN 1633223515
Impossible Folding Puzzle and Other Mathematical Paradoxes
Hidden Picture Puzzles
Impossible Folding Puzzles
ISBN 0486493512
Hidden Picture Puzzles
ISBN 1623540380
How To Draw Incredible Illusions
Amazing Optical Illusions
How To Draw Incredible Illusions
ISBN 1623540607
Amazing Optical Illusions
ISBN 1787391639
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Mental activities and tutorials that enhance critical and creative thinking skills

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