### Topic Page: coordinate geometry

**coordinate geometry**from

*Greenwood Dictionary of Education*

A branch of mathematics invented by Reneé Descartes whereby a plane is divided into upper and lower portions by the horizontal axis and into right and left portions by the vertical axis (this plane is known as the Cartesian coordinate plane, the coordinate plane, or the x-y plane). Many areas of mathematics, notably analytic geometry and calculus, use coordinate geometry extensively in the solutions of many mathematical problems. (dbc)

**coordinate geometry**from

*The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide*

System of geometry in which points, lines, shapes, and surfaces are represented by algebraic expressions. In plane (two-dimensional) coordinate geometry, the plane is usually defined by two axes at right angles to each other, the horizontal x-axis and the vertical y-axis, meeting at O, the origin. A point on the plane can be represented by a pair of Cartesian coordinates, which define its position in terms of its distance along the x-axis and along the y-axis from O. These distances are, respectively, the x and y coordinates of the point.

Lines are represented as equations; for example, y = 2x + 1 gives a straight line, and y = 3x^{2} + 2x gives a parabola (a curve). The graphs of varying equations can be drawn by plotting the coordinates of points that satisfy their equations, and joining up the points. One of the advantages of coordinate geometry is that geometrical solutions can be obtained without drawing but by manipulating algebraic expressions. For example, the coordinates of the point of intersection of two straight lines can be determined by finding the unique values of x and y that satisfy both of the equations for the lines, that is, by solving them as a pair of simultaneous equations. The curves studied in simple coordinate geometry are the conic sections (circle, ellipse, parabola, and hyperbola), each of which has a characteristic equation.

In three-dimensional coordinate geometry, a point in space is represented by three coordinates (x,y,z), defined by reference to three axes at right angles to each other.

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