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If circumference of circle is 82π then value of 'r' is

  • A.41 cm
  • B.82 cm
  • C.27.34 cm
  • D.20 cm

Answer: A

\[ 2\pi r = 82\pi \quad\Longrightarrow\quad 2r = 82 \]

\[ r = 41 \text{ cm} \]

The 82 cm on offer is the diameter, one step short of the answer.

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