Cartesian geometry In mathematics, the Cartesian coordinate system is used to determine each point uniquely in a plane through two numbers, usually called the x-coordinate or abscissa and the y-coordinate or ordinate of the point. The idea of this system was developed in 1637 in two writings by Descartes and independently by Pierre de Fermat, although Fermat did not publish the discovery

# Math

It's all starting to add up. These are the best Math questions around, and we're positive that you'll derive a lot of fun from answering them. Don't forget to make it count.

## The symbol ? (sideways 8) means what in mathematics?

## How many square feet are there in a square yard?

## What is the square root of 225?

## How many equal sides does an icosahedron have?

## What is the square root of one quarter?

## What may be mixed, complex or vulgar?

## How many sides does an “Enneadecagon” have?

## What digit did Arab mathematician al-Khwarizmi give to the West around 800 B/B.?

## What was the name of the guest guitarist on Michael Jackson’s Dangerous album?

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