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Question

A circle has a diameter of 42 cm. What would be its circumference ? 
  1. 120 cm
  2. 210 cm
  3. 100 cm
  4. 132 cm


Solution

The correct option is D 132 cm
We know that the circumference of the circle is given by 2πr,  where r is the radius of the circle.
i.e., Circumference=2πr=π×(2r)
                                =π× diameter
                                =227×42
                                =132 cm

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