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Home > Shapes
Puzzles involving various geometric shapes, in a flat plane and in three-dimensional space.
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A quadrilateral is a _________ if and only if the sum of the squares of its sides is equal to the sum of the squares of its diagonals. Prove it.
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 Triangle in a triangle | Posted on 2017-08-28 by Jer (No Solution Yet, 4 Comments) Planks across a ditch | Rating: 4.00 Posted on 2017-08-17 by Jer (No Solution Yet, 4 Comments)Ellipse in a Truncated Triangle | Posted on 2017-08-13 by Brian Smith (No Solution Yet, 0 Comments)  Seven Region Partition | Posted on 2017-05-27 by Brian Smith (No Solution Yet, 3 Comments)Seven Point Placement | Rating: 4.00 Posted on 2017-05-20 by Brian Smith (No Solution Yet, 1 Comments)  Sticks in a Cube | Posted on 2017-04-11 by Brian Smith (No Solution Yet, 3 Comments) Elongated Pentagonal Orthocupola's vertices | Posted on 2017-03-20 by Ady TZIDON (No Solution Yet, 3 Comments) A Square Slab and a Cube | Posted on 2017-03-12 by Brian Smith (No Solution Yet, 2 Comments) Staircases in a Cube | Posted on 2017-03-10 by Brian Smith (No Solution Yet, 1 Comments) Pentagon Partitions | Posted on 2016-12-11 by Brian Smith (No Solution Yet, 3 Comments) Gluing Cubes | Posted on 2016-12-08 by Brian Smith (No Solution Yet, 1 Comments) Seven Hexominos and Two Triominos | Posted on 2016-11-26 by Brian Smith (No Solution Yet, 1 Comments) Covering a Rectangle with Hexominos | Posted on 2016-11-05 by Brian Smith (No Solution Yet, 1 Comments) The Ninth Hexomino | Posted on 2016-10-28 by Brian Smith (No Solution Yet, 1 Comments) |
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