Question

What are Polar Coordinates?

Answer 1

See http://mathworld.wolfram.com/PolarCoordinates.html

Explanation:

I can give a simple answer, i.e. a combination of a radial coordinate r and the angle `theta`, which we give as an ordered pair `(r,theta)`.

I believe, though, that reading up what is said other places on the Internet, for instance http://mathworld.wolfram.com/PolarCoordinates.html, will be of more help.