a sphere is a 3D circle like a ball 3D Items you can pick up they have three dimentions (they stand out)
a circle is a 2D item like a pattern of circles 2D items have 2 dimentions (they're flat)
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A small circle is a simple circle on a two dimensional plane. The great circle is the circle around a sphere that is on the plane that intersects with the center of the sphere. It is the reason that on a flat map the paths of planes seem to curve to go to and from Europe and the North American continent.
A hemisphere is half a sphere
Sphere is whole a hemisphere is not
A sphere is three dimensional, a circle is not. So a tennis ball is sphere not a circle You can draw a circle on paper but is is not a sphere.
no, it is sphere is not a perfect circle. because sphere is 3dimensional figure and circle is 2 dimensional figure