From Citizendium, the Citizens' Compendium
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- Circumcentre : The centre of the circle that goes through the vertices of a triangle or a cyclic polygon.
- Cyclic polygon : A polygon whose vertices lie on a single circle.
- Euclidean geometry : Form of geometry first codified by Euclid in his series of thirteen books, The Elements.
- Geometry : The mathematics of spacial concepts.
- Pascal's triangle : A convenient tabular presentation for the binomial coefficients.
- Plane (geometry) : In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points.
- Point (geometry) : An object that has a position but no length, breadth or depth.
- Polyhedron : A three-dimensional geometric closed figure bounded by a connected set of polygons.
- Polytope : The analog to a polygon or polyhedron in any number of dimensions or a polytope in n dimensions is a figure bounded by connected polytopes of dimension n-1.
- Prime number : A number that can be evenly divided by exactly two positive whole numbers, namely one and itself.
- Prism (geometry) : A polyhedron made of two congruent polygons connected with rectangles that correspond with the number of the polygon's sides.
- Rectangle : A four-sided plane figure with four right angles.
- Rhombus : An equilateral parallelogram.
- Square : Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Square (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
- Steradian : Unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared.
- Triangle : A polygon with three sides meeting at three corners.