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2. Triangular prism - Wikipedia

   en.wikipedia.org/wiki/Triangular_prism

   If the prism's edges are perpendicular to the base, the lateral faces are rectangles, and the prism is called a right triangular prism. [3] This prism may also be considered a special case of a wedge. [4] 3D model of a (uniform) triangular prism. If the base is equilateral and the lateral faces are square, then the right triangular prism is ...

3. Prism (geometry) - Wikipedia

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

   An oblique prism is a prism in which the joining edges and faces are not perpendicular to the base faces. Example: a parallelepiped is an oblique prism whose base is a parallelogram, or equivalently a polyhedron with six parallelogram faces. Right Prism. A right prism is a prism in which the joining edges and faces are perpendicular to the base ...

4. Cross section (geometry) - Wikipedia

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

   The boundary of a cross-section in three-dimensional space that is parallel to two of the axes, that is, parallel to the plane determined by these axes, is sometimes referred to as a contour line; for example, if a plane cuts through mountains of a raised-relief map parallel to the ground, the result is a contour line in two-dimensional space ...

5. Octagonal prism - Wikipedia

   en.wikipedia.org/wiki/Octagonal_prism

   Download as PDF; Printable version ... the octagonal prism is a prism comprising eight rectangular sides ... octagonal prisms are used to generate flicker-free images ...

6. Cavalieri's principle - Wikipedia

   en.wikipedia.org/wiki/Cavalieri's_principle

   The two points tracing the cycloids are therefore at equal heights. The line through them is therefore horizontal (i.e. parallel to the two lines on which the circle rolls). Consequently each horizontal cross-section of the circle has the same length as the corresponding horizontal cross-section of the region bounded by the two arcs of cycloids.

7. Hexagonal prism - Wikipedia

   en.wikipedia.org/wiki/Hexagonal_prism

   3D model of a uniform hexagonal prism. In geometry, the hexagonal prism is a prism with hexagonal base. Prisms are polyhedrons; this polyhedron has 8 faces, 18 edges, and 12 vertices. [1] Since it has 8 faces, it is an octahedron. However, the term octahedron is primarily used to refer to the regular octahedron, which has eight triangular faces.

8. Pentagonal prism - Wikipedia

   en.wikipedia.org/wiki/Pentagonal_prism

   The volume, as for all prisms, is the product of the area of the pentagonal base times the height or distance along any edge perpendicular to the base. For a uniform pentagonal prism with edges h the formula is

9. Centroid - Wikipedia

   en.wikipedia.org/wiki/Centroid

   The centroid of a ring or a bowl, for example, lies in the object's central void. If the centroid is defined, it is a fixed point of all isometries in its symmetry group . In particular, the geometric centroid of an object lies in the intersection of all its hyperplanes of symmetry .