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Geometry is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician who works in the field of geometry is called a geometer. Until the 19th century, geometry was almost exclusively devoted to Euclidean geometry, which includes the notions of point, line, plane, distance, angle, surface, and curve, as fundamental concepts.

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Geometry is a branch of mathematics that studies the properties of space, including how far apart things are, what shape they have, how big they are, and where they sit relative to each other. It's one of the oldest areas of mathematics and has been a central tool for understanding the physical world and solving practical problems throughout history.

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