Geometry is a branch of mathematics that includes the study of shape, size, and other properties of figures. It is one of the oldest branches of mathematics, probably used even in prehistoric times.
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The kind of geometry most students usually study was recorded in The Elements, a set of books written about 300 BC by Euclid, a Greek mathematician. There are now other kinds of geometry as well. These other kinds originated about 2,000 years after Euclid's work.
Related word geometric.