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Home > Shapes
Puzzles involving various geometric shapes, in a flat plane and in three-dimensional space.
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Prove that the sum of the six angles subtended at an interior point of a tetrahedron by its six edges is greater than 540 degree.
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 Square to Cone Conversion | Posted on 2020-09-12 by Larry (No Solution Yet, 1 Comments)Sphere parts | Posted on 2020-09-09 by Danish Ahmed Khan (No Solution Yet, 1 Comments)  Extreme revolving cuboid | Posted on 2020-08-28 by Danish Ahmed Khan (No Solution Yet, 4 Comments)Cosine cups | Posted on 2020-08-07 by Danish Ahmed Khan (No Solution Yet, 5 Comments)  Tilted drum | Posted on 2020-06-12 by Danish Ahmed Khan (No Solution Yet, 2 Comments)Reflection Triangle | Rating: 4.00 Posted on 2020-01-24 by Danish Ahmed Khan (No Solution Yet, 5 Comments) Maximal Rectangle | Posted on 2019-12-30 by Danish Ahmed Khan (No Solution Yet, 4 Comments) Heptagonal Triangle | Posted on 2019-12-27 by Danish Ahmed Khan (No Solution Yet, 4 Comments) Three Squares make a Triangle | Posted on 2019-12-23 by Larry (No Solution Yet, 3 Comments) Triangle rotation | Posted on 2019-10-02 by Danish Ahmed Khan (No Solution Yet, 5 Comments) Area of central locus | Posted on 2019-09-19 by Danish Ahmed Khan (No Solution Yet, 1 Comments) Locate the Locus | Posted on 2019-09-18 by Danish Ahmed Khan (No Solution Yet, 2 Comments) The Five Touching Spheres 2 | Posted on 2019-09-15 by Brian Smith (Solution Posted, 4 Comments) Spherical displacement of water | Rating: 5.00 Posted on 2019-09-13 by Danish Ahmed Khan (No Solution Yet, 9 Comments) |
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