a sphere is a 3-D shape and a circle is 2-D its flat and the sphere is like a round you can feel it
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Sphere
It is the diameter of the circle or the sphere
sphere
No. Every circle on the sphere whose center is also the center of the sphere is a great circle. If the circle's center is not also the center of the sphere, then the circle is a small circle.
A circle on the surface of a sphere that has the same radius as the sphere.