Yes, within the same circle
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Yes. All radii of the same circle have the same length.
Yes, providing that the radii are all in the same circle
No. To be similar ALL lengths must be in the same ratio. If two cylinders have the same radii, but different heights then the radii have one ratio (1:1) but the heights have a different ratio; thus they are not similar.
The sum of two radii of a circle is the same as the diameter of the circle.
They must have all angles which are the same, all of whose straight lines are in the same ratio and whose curves have radii of curvature in the same ratio.