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  2. Inverse Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Inverse_Pythagorean_theorem

    In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem [1] or the upside down Pythagorean theorem [2]) is as follows: [3] Let A, B be the endpoints of the hypotenuse of a right triangle ABC. Let D be the foot of a perpendicular dropped from C, the vertex of the right angle, to the hypotenuse. Then

  3. Van Hiele model - Wikipedia

    en.wikipedia.org/wiki/Van_Hiele_model

    Children simply say, "That is a circle," usually without further description. Children identify prototypes of basic geometrical figures (triangle, circle, square). These visual prototypes are then used to identify other shapes. A shape is a circle because it looks like a sun; a shape is a rectangle because it looks like a door or a box; and so on.

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    may mean that A is a subset of B, and is possibly equal to B; that is, every element of A belongs to B; expressed as a formula, ,. 2. A ⊂ B {\displaystyle A\subset B} may mean that A is a proper subset of B , that is the two sets are different, and every element of A belongs to B ; expressed as a formula, A ≠ B ∧ ∀ x , x ∈ A ⇒ x ∈ ...

  5. Toeplitz matrix - Wikipedia

    en.wikipedia.org/wiki/Toeplitz_matrix

    Hankel matrix, an "upside down" (i.e., row-reversed) Toeplitz matrix Szegő limit theorems – Determinant of large Toeplitz matrices Toeplitz operator – compression of a multiplication operator on the circle to the Hardy space Pages displaying wikidata descriptions as a fallback

  6. Sierpiński triangle - Wikipedia

    en.wikipedia.org/wiki/Sierpiński_triangle

    If v 1 is outside the triangle, the only way v n will land on the actual triangle, is if v n is on what would be part of the triangle, if the triangle was infinitely large. Or more simply: Take three points in a plane to form a triangle. Randomly select any point inside the triangle and consider that your current position.

  7. Rotational symmetry - Wikipedia

    en.wikipedia.org/wiki/Rotational_symmetry

    p3 (333): 3×3-fold; not the rotation group of any lattice (every lattice is upside-down the same, but that does not apply for this symmetry); it is e.g. the rotation group of the regular triangular tiling with the equilateral triangles alternatingly colored. p4 (442): 2×4-fold, 2×2-fold; rotation group of a square lattice.

  8. The Secrets of Triangles - Wikipedia

    en.wikipedia.org/wiki/The_Secrets_of_Triangles

    The chapter on areas includes both trigonometric formulas and Heron's formula for computing the area of a triangle from its side lengths, and the chapter on inequalities includes the Erdős–Mordell inequality on sums of distances from the sides of a triangle and Weitzenböck's inequality relating the area of a triangle to that of squares on ...

  9. Borromean rings - Wikipedia

    en.wikipedia.org/wiki/Borromean_rings

    A stone pillar in the 6th-century Marundeeswarar Temple in India shows three equilateral triangles rotated from each other to form a regular enneagram; like the Borromean rings these three triangles are linked and not pairwise linked, [12] but this crossing pattern describes a different link than the Borromean rings. [13]

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