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1. mathematics of shapes: the branch of mathematics that is concerned with the properties and relationships of points, lines, angles, curves, surfaces, and solids

2. kind of geometry: a particular system or class of geometry, e.g. a set of distinct theories or its application to a particular type of problem or object

●Euclidean geometry

● Solid geometry

3. reasoning of particular field: the principles of reasoning relevant to a particular field

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