step 1: make a circle with a compass
step 2: divide the circle into 4 equal parts
step 3: draw curved lines
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you can draw infinite lines
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.
A great circle is any circle whose center is also the center of the sphere. You could try this way: Spread ink on a sheet of paper. Set the sphere on the paper so that it picks up a mark from the ink, and at the same time, place a mark on the highest point of the sphere. Then draw any circle on the sphere that includes those two points. As we read the question, we were fascinated by the implication that you have spheres with more or less than 3 dimensions.
The radius of a sphere is equal distance from the center of the sphere to all points within the sphere.
Sphere is one syllable: sphere.