The Sphere
Secondary 3
The sphere is the only solid that is entirely composed of a curved face.
The sphere is the set of points located at the same distance from the centre called a "radius".
The Characteristics of a Sphere
All the radii that can be drawn to delimit the sphere meet at a point called the centre.
For example, the blue lines illustrate several of the radii defining the space occupied by the following sphere.
Moreover, all the radii thus formed have the same measure.
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