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1969 AMC 12 Question 6

AMC12 · 1969 AMC 12

Question 6

The area of the ring between two concentric circles is $12\dfrac12\pi$ square inches. The length of a chord of the larger circle tangent to the smaller circle, in inches, is:
  1. $\dfrac5{\sqrt2}$
  2. $5$
  3. $5\sqrt2$
  4. $10$
  5. $10\sqrt2$