Question

Define orthogonal co-ordinate system.

Answer 1

Orthogonal coordinates.

For example, the three-dimensional Cartesian coordinates is an orthogonal coordinate system, since its coordinate surfaces x = constant, y = constant, and z = constant are planes that meet at right angles to one another, i.e., are perpendicular.

Answer 2

An orthogonal coordinate system is a system of curvilinear coordinates in which each family of surfaces intersects the others at right angles