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What is the Difference between the perimeteres of two concentric circles is 66 Find the difference between radius?
Wiki User
∙ 12y ago
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)
Wiki User
∙ 12y ago
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