Math Dictionary

Concentric Circles

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Two or more circles which have the same center point


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Curved inwards.

A polygon (which is straight-sided) is concave if there are “dents” or indentations in it.

You can remember it by con-“cave” (it has a cave in it!)


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A machine that can be programmed to do things with data.

Computers can usually:
* “input” data from a mouse, keyboard or touch-screen,
* “process” the data using a CPU and memory, and
* “output” the result onto a screen or save it to disk.


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Computation is finding an answer by using mathematics or logic.

You can use a computer to do computations.

But you can also do computations yourself when you add, subtract, multiply, etc.