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# Base (geometry)

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Many geometric shapes of more than two dimensions are constructed by using regular two-dimensional shapes. That way a Tetrahedron is constructed with four triangles, a cube uses six squares. In that context, the shape that is used for construction is called **base**. The triangle is the base of the tetrahedron, and the square is the base of the cube.

Note, that there are geometric figures that use different shapes. A pyramid uses one rectangle and four triangles. In that context, the rectangle is said to be the base of the shape. A cylinder uses a circle or an ellipse as a base.