# ___ ball

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it’s A 8 letters crossword definition.
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### Random information on the term “___ ball”:

In mathematics, a ball is the space bounded by a sphere. It may be a closed ball (including the boundary points that constitute the sphere) or an open ball (excluding them).

These concepts are defined not only in three-dimensional Euclidean space but also for lower and higher dimensions, and for metric spaces in general. A ball or hyperball in n dimensions is called an n-ball and is bounded by an (n − 1)-sphere. Thus, for example, a ball in the Euclidean plane is the same thing as a disk, the area bounded by a circle. In Euclidean 3-space, a ball is taken to be the volume bounded by a 2-dimensional sphere. In a one-dimensional space, a ball is a line segment.

In other contexts, such as in Euclidean geometry and informal use, sphere is sometimes used to mean ball.

In general practice, the volume of a ball is calculated as:

where r is the radius and d is the diameter of the ball.

In Euclidean n-space, an (open) n-ball of radius r and center x is the set of all points of distance less than r from x. A closed n-ball of radius r is the set of all points of distance less than or equal to r away from x.

### Random information on the term “NERF”:

Reynolds “Reyn” Winsor Guyer (born in St. Paul, Minnesota in 1935) is an American inventor.

Among his notable developments are Twister in 1967 and the NERF ball in 1969, which he developed for Milton Bradley and Parker Brothers, respectively. He was inducted into the Hasbro toy and game Inventors’ Hall of Fame in 1986.

Besides his work as a toy inventor, Guyer has also founded a music publishing company called Wrensong/Reynsong Music of Nashville in 1985.

Having struggled with dyslexia himself, Reyn cofounded Winsor Learning in 1991 to help children who also struggle to read. The Sonday System and Let’s Play Learn are effective remediation methods for students who are behind in their reading skills. These programs are used in hundreds of school systems across the country.