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C. 4.5 inches
To find the radius of the smaller circle, we can set up a proportion:
(Length of arc on larger circle) / (Radius of larger circle) = (Length of arc on smaller circle) / (Radius of smaller circle)
Plugging in the values:
51 / 11 = 21 / x
Solving for x:
x = (11 * 21) / 51
x = 4.5
Therefore, the radius of the smaller circle is 4.5 inches.