it was either made in the date of 255 BC or 150 A.DI'm not sure (read it in books!)
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An armillary sphere is a device for studying the rotation of the earth and other astronomical bodies (i think lol)
no, a sphere is a ball.
no. bubbles can only be made into sphere shapes.only a trick can make a bubble into a different shape
A hemisphere is a half of a sphere, divided by a plane passing through its center. It has a flat base where the cut was made, while a sphere is a three-dimensional shape with no flat surfaces. The hemisphere has a curved surface area and volume that are half that of a full sphere.
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.