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1950 AMC 12 Question 34

AMC12 · 1950 AMC 12

Question 34

When the circumference of a toy balloon is increased from $20$ inches to $25$ inches, the radius is increased by:
  1. $5$ in
  2. $2\dfrac12$ in
  3. $\dfrac5\pi$ in
  4. $\dfrac{5}{2\pi}$ in
  5. $\dfrac{\pi}{5}$ in