ball
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A ball in mathematics is the solid region enclosed inside a sphere, including all the space within it. It's an important concept in geometry and other areas of math because it helps us understand and work with three-dimensional shapes and spaces.
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In Euclidean space, a ball is the volume bounded by a sphere
In mathematics, a ball is the solid figure bounded by a sphere; it is also called a solid sphere. It may be a closed ball (including the boundary points that constitute the sphere) or an open ball (excluding them).