Congruent spheres
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True
Yes, all radii of a circle have the same length. One often thinks of the radius as being this length.
Yes providing that they are in the same circle
The plural of 'radius' is 'radii', not 'radiuses'. A circle has an infinite number of radii, but they are all of the same length.
That's right. In a circle, the length of a diameter will be the same as twice the length of a radius.