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no, it is sphere is not a perfect circle. because sphere is 3dimensional figure and circle is 2 dimensional figure
Perfect sphere is completely smmytrical.
The sphere that we all live on is called the Earth. (It is not a perfect sphere, but close enough)
i delcare that columus believed the world was flat, but it is a perfect sphere! does this answer your question?
one, if its a perfect sphere the radius will be constant whereever you measure it