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  2. Centroid - Wikipedia

    en.wikipedia.org/wiki/Centroid

    The area of the triangle is times the length of any side times the perpendicular distance from the side to the centroid. [15] A triangle's centroid lies on its Euler line between its orthocenter and its circumcenter, exactly twice as close to the latter as to the former: [16] [17]

  3. List of centroids - Wikipedia

    en.wikipedia.org/wiki/List_of_centroids

    The following is a list of centroids of various two-dimensional and three-dimensional objects. The centroid of an object in -dimensional space is the intersection of all hyperplanes that divide into two parts of equal moment about the hyperplane.

  4. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    If A 1, A 2, A 3 and A 4 denote the area of each faces, the value of r is given by = + + +. This formula is obtained from dividing the tetrahedron into four tetrahedra whose points are the three points of one of the original faces and the incenter.

  5. Median (geometry) - Wikipedia

    en.wikipedia.org/wiki/Median_(geometry)

    Each median divides the area of the triangle in half, hence the name, and hence a triangular object of uniform density would balance on any median. (Any other lines that divide triangle's area into two equal parts do not pass through the centroid.) [2] [3] The three medians divide the triangle into six smaller triangles of equal area.

  6. Barycentric coordinate system - Wikipedia

    en.wikipedia.org/wiki/Barycentric_coordinate_system

    A 3-simplex, with barycentric subdivisions of 1-faces (edges) 2-faces (triangles) and 3-faces (body). In geometry , a barycentric coordinate system is a coordinate system in which the location of a point is specified by reference to a simplex (a triangle for points in a plane , a tetrahedron for points in three-dimensional space , etc.).

  7. Euler line - Wikipedia

    en.wikipedia.org/wiki/Euler_line

    The Euler lines of the 10 triangles with vertices chosen from A, B, C, F 1 and F 2 are concurrent at the centroid of triangle ABC. [ 12 ] The Euler lines of the four triangles formed by an orthocentric system (a set of four points such that each is the orthocenter of the triangle with vertices at the other three points) are concurrent at the ...

  8. Equilateral triangle - Wikipedia

    en.wikipedia.org/wiki/Equilateral_triangle

    The formula of the area of an equilateral triangle can be obtained by substituting the altitude formula. [7] Another way to prove the area of an equilateral triangle is by using the trigonometric function. The area of a triangle is formulated as the half product of base and height and the sine of an angle. Because all of the angles of an ...

  9. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    The largest possible ratio of the area of the inscribed square to the area of the triangle is 1/2, which occurs when =, = /, and the altitude of the triangle from the base of length is equal to . The smallest possible ratio of the side of one inscribed square to the side of another in the same non-obtuse triangle is 2 2 / 3 {\displaystyle 2 ...