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Formula used to measure circumference of circle is

  • A.2πr
  • B.πr² + 2r
  • C.πr²
  • D.3πr²

Answer: A

\[ C = 2\pi r \]

A circumference is a length, so it must be proportional to \( r \) rather than \( r^{2} \) - which rules out the area formula \( \pi r^{2} \) on dimensional grounds alone.

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