No but a sphere is
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Hey, With 2 axes its x and y with 3 its x,y and z Toby
You do not. You see it stereoscopically, but the brain compares the images with experience and assumes threedimensional interpretations. This can be used to fool people with optical illusions. Forms that are possible in a twodimensional world, but does not have a representation in 3D that makes sense.
You draw a circle around a circle.
Its the distance from the center of the circle to the edge of the circle.
The cord of a circle that contains the center of that circle is a diameter of that circle.