10:06

Polygons

Triangle Coordinate Proof Intro

In mathematics, a coordinate system is a system that uses one or more numbers, or coordinates, to uniquely determine the position of a point or other geometric element on a manifold such as Euclidean space. The order of the coordinates is significant, and they are sometimes identified by their position in an ordered tuple and sometimes by a letter, as in "the x-coordinate". The coordinates are taken to be real numbers in elementary mathematics, but may be complex numbers or elements of a more abstract system such as a commutative ring. The use of a coordinate system allows problems in geometry to be translated into problems about numbers and vice versa; this is the basis of analytic geometry.

Kurt Kleinberg

More coordinate proofs with quadrilaterals

Paralleolograms and other quadrilateral coordinate proof examples

Perimeter and area of polygons in the plane intro

Perimeter and area of polygons using coordinates examples

Triangle Coordinate Proof Intro

Triangle coordinate proof examples