A sphere is generated when a semicircle is rotated about the line.
What is solid revolution?
A solid of revolution is a solid figure obtained by rotating a plane curve around some straight line.
What is sphere?
Sphere is the set of all points in three-dimensional space lying the same distance from a given point or the result of rotating a semicircle about one of its diameters.
According to the given question.
A semicircle is rotated about the line.
Now,
From the definition of sphere we can say that, when a semicircle is rotated about a line a sphere will generate.
Therefore, a sphere is generated when a semicircle is rotated about the line.
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