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Four identical circular coins are placed inside the square $ABCD$ as in the following diagram:

If for each coin, (area/circumference) = (circumference/ area) then the area not occupied by the corns in $ABCD$ is

  1. $8(4-\pi)$
  2. $16(8-\pi)$
  3. $16(4-\pi)$
  4. None of these
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makhdoom ghaya asked Apr 20, 2017
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Three circles, each of radius $20$ and centres at $P, Q, R$. Further, $AB=5, CD=10$ and $EF=12$. What is the perimeter of the triangle $PQR$?$60$ cm$81$ cm$93$ cm$87$ cm