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2. List of two-dimensional geometric shapes - Wikipedia

   en.wikipedia.org/wiki/List_of_two-dimensional...

   This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.

3. Lozenge (shape) - Wikipedia

   en.wikipedia.org/wiki/Lozenge_(shape)

   The lozenge shape is often used in parquetry (with acute angles that are 360°/n with n being an integer higher than 4, because they can be used to form a set of tiles of the same shape and size, reusable to cover the plane in various geometric patterns as the result of a tiling process called tessellation in mathematics) and as decoration on ...

4. List of fractals by Hausdorff dimension - Wikipedia

   en.wikipedia.org/wiki/List_of_fractals_by...

   2<D<2.3: Pyramid surface: Each triangle is replaced by 6 triangles, of which 4 identical triangles form a diamond based pyramid and the remaining two remain flat with lengths and relative to the pyramid triangles. The dimension is a parameter, self-intersection occurs for values greater than 2.3.

5. 2D geometric model - Wikipedia

   en.wikipedia.org/wiki/2D_geometric_model

   A 2D geometric model is a geometric model of an object as a two-dimensional figure, usually on the Euclidean or Cartesian plane. Even though all material objects are three-dimensional, a 2D geometric model is often adequate for certain flat objects, such as paper cut-outs and machine parts made of sheet metal .

6. Shape analysis (digital geometry) - Wikipedia

   en.wikipedia.org/wiki/Shape_analysis_(digital...

   Shape descriptors can be classified by their invariance with respect to the transformations allowed in the associated shape definition. Many descriptors are invariant with respect to congruency, meaning that congruent shapes (shapes that could be translated, rotated and mirrored) will have the same descriptor (for example moment or spherical harmonic based descriptors or Procrustes analysis ...

7. Pandiagonal magic square - Wikipedia

   en.wikipedia.org/wiki/Pandiagonal_magic_square

   A pandiagonal magic square or panmagic square (also diabolic square, diabolical square or diabolical magic square) is a magic square with the additional property that the broken diagonals, i.e. the diagonals that wrap round at the edges of the square, also add up to the magic constant.