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# Geometry

**Geometry** is a kind of mathematics that studies the size, shapes, and positions of things. There are flat shapes and solid shapes in geometry.

Squares, circles, and triangles are some of the simplest shapes in flat geometry. Cubes, cylinders, cones, and spheres are simple shapes in solid geometry.

Geometry can be used to measure the area and perimeter of a flat shape. It can also be used to measure a solid shape's volume and surface area.