The Usborne illustrated dictionary of math

The Usborne Illustrated Dictionary of Mathematics
(Illustrated Dictionaries) by Tori Large

Everyone studying math needs this book, and it is an essential review guide for
examination candidates. Over 500 definitions of all the key terms and concepts.
More than 300 useful illustrations and diagrams. Over 100 worked examples.
Comprehensive cross-referencing and detailed index. Internet links to
recommended websites