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  2. Pyramid (geometry) - Wikipedia

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

    The pyramid height is defined as the length of the line segment between the apex and its orthogonal projection on the base. Given that B {\displaystyle B} is the base's area and h {\displaystyle h} is the height of a pyramid, the volume of a pyramid is: [ 25 ] V = 1 3 B h . {\displaystyle V={\frac {1}{3}}Bh.}

  3. Intercept theorem - Wikipedia

    en.wikipedia.org/wiki/Intercept_theorem

    Thales measured the length of the pyramid's base and the height of his pole. Then at the same time of the day he measured the length of the pyramid's shadow and the length of the pole's shadow. This yielded the following data: height of the pole (A): 1.63 m; shadow of the pole (B): 2 m; length of the pyramid base: 230 m; shadow of the pyramid: 65 m

  4. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    The volume of a tetrahedron can be obtained in many ways. It can be given by using the formula of the pyramid's volume: =. where is the base' area and is the height from the base to the apex. This applies for each of the four choices of the base, so the distances from the apices to the opposite faces are inversely proportional to the areas of ...

  5. List of centroids - Wikipedia

    en.wikipedia.org/wiki/List_of_centroids

    h = the distance is from base to the apex General triangular prism: b = the base side of the prism's triangular base, h = the height of the prism's triangular base L = the length of the prism see above for general

  6. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    The area formula for a triangle can be proven by cutting two copies of the triangle into pieces and rearranging them into a rectangle. In the Euclidean plane, area is defined by comparison with a square of side length ⁠ ⁠, which has area 1. There are several ways to calculate the area of an arbitrary triangle.

  7. Apothem - Wikipedia

    en.wikipedia.org/wiki/Apothem

    Apothem of a hexagon Graphs of side, s; apothem, a; and area, A of regular polygons of n sides and circumradius 1, with the base, b of a rectangle with the same area. The green line shows the case n = 6. The apothem (sometimes abbreviated as apo [1]) of a regular polygon is a line

  8. Method of exhaustion - Wikipedia

    en.wikipedia.org/wiki/Method_of_exhaustion

    Proposition 10: The volume of a cone is a third of the volume of the corresponding cylinder which has the same base and height. [5] Proposition 11: The volume of a cone (or cylinder) of the same height is proportional to the area of the base. [6]

  9. Base (geometry) - Wikipedia

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

    In a triangle, any arbitrary side can be considered the base. The two endpoints of the base are called base vertices and the corresponding angles are called base angles. The third vertex opposite the base is called the apex. The extended base of a triangle (a particular case of an extended side) is the line that contains the base.