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  2. Equilateral triangle - Wikipedia

    en.wikipedia.org/wiki/Equilateral_triangle

    An equilateral triangle is a triangle in which all three sides have the same length, and all three angles are equal. Because of these properties, the equilateral triangle is a regular polygon, occasionally known as the regular triangle. It is the special case of an isosceles triangle by modern definition, creating more special properties.

  3. Dallara F3 2019 - Wikipedia

    en.wikipedia.org/wiki/Dallara_F3_2019

    The Dallara F3 2019 is an open-wheel racing car developed by Italian manufacturer Dallara for use in the FIA Formula 3 Championship, a feeder series for Formula One.The F3 2019 is the first car used by the FIA Formula 3 Championship and was introduced for the championship's inaugural season and scheduled to be used until the 2024 season before being replaced by planned Dallara F3 2025 from ...

  4. Area of a triangle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_triangle

    The area of a triangle can be demonstrated, for example by means of the congruence of triangles, as half of the area of a parallelogram that has the same base length and height. A graphic derivation of the formula T = h 2 b {\displaystyle T={\frac {h}{2}}b} that avoids the usual procedure of doubling the area of the triangle and then halving it.

  5. Formula Three - Wikipedia

    en.wikipedia.org/wiki/Formula_Three

    Although called British Formula 3 in the UK, this is to avoid confusion with Formula 4. The car is a Tatuus Formula 4 tub with superior aerodynamics to the F4 cars in other series. The engines are tuned 2 liter Ford Duratec engines without air restrictor. Non-FIA regulations series Chilean Formula Three Championship: Chile: 1972–1974 1976 ...

  6. Ptolemy's theorem - Wikipedia

    en.wikipedia.org/wiki/Ptolemy's_theorem

    Ptolemy's Theorem yields as a corollary a pretty theorem [2] regarding an equilateral triangle inscribed in a circle. Given An equilateral triangle inscribed on a circle and a point on the circle. The distance from the point to the most distant vertex of the triangle is the sum of the distances from the point to the two nearer vertices.

  7. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    Calculation of the area of a square whose length and width are 1 metre would be: 1 metre × 1 metre = 1 m 2. and so, a rectangle with different sides (say length of 3 metres and width of 2 metres) would have an area in square units that can be calculated as: 3 metres × 2 metres = 6 m 2. This is equivalent to 6 million square millimetres.

  8. Dihedral group of order 6 - Wikipedia

    en.wikipedia.org/wiki/Dihedral_group_of_order_6

    The dihedral group D 3 is the symmetry group of an equilateral triangle, that is, it is the set of all rigid transformations (reflections, rotations, and combinations of these) that leave the shape and position of this triangle fixed. In the case of D 3, every possible permutation of the triangle's vertices constitutes such a transformation, so ...

  9. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    An equilateral triangle base and three equal isosceles triangle sides It gives 6 isometries, corresponding to the 6 isometries of the base. As permutations of the vertices, these 6 isometries are the identity 1, (123), (132), (12), (13) and (23), forming the symmetry group C 3v , isomorphic to the symmetric group , S 3 .