the distance across the middle is the radius and whole distance across it is the diameter
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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.
The precise definition of the word 'centres' is the middle point of a circle or a sphere. This means the point is an equal distance from every point on the circle/sphere.
no, it is sphere is not a perfect circle. because sphere is 3dimensional figure and circle is 2 dimensional figure
A sphere is a 3D circle. Like a baseball.
Square is to cube as circle is to.......sphere