![]() The meridians are the circumferences obtained on cutting the sphere's surface with planes that contain the rotation axis.The equator is the circumference obtained on cutting the sphee's surface with the plane perpendicular to the axis of rotation that contains the center of the sphere.The parallels are the circumferences obtained on cutting the sphere's surface with planes perpendicular to the axis of rotation.In addition to these elements, we can also define: ![]()
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