the word 'radius-es' doesn't exist, the word 'radii' is the plural of 'radius'
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If they're in the same circle or in circles of equal radii (radiuses), then yes.
None. On;ly circles have radiuses.
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
It is the smaller of the 2 part divided between 2 radii
The formula for the circumference, (C) of a circle is C = 2πr.....where r is the radius. Let R be the radius of the larger circle and r the radius of the smaller circle. Then 66 = 2πR - 2πr = 2π(R - r) Then R - r = 66/2π = 33/π ≅ 10.504 The difference between the two radii is 10.504 (3dp)