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The circumference of a circle is 21.3mm. Find the length of the radius. Give your answer rounded to 1 DP.

Guest Mar 23, 2017
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Circumference  = 2 * pi * radius  .......so...

 

21.3  =  2 * pi  *  radius     .......divide both sides by  2 * pi

 

21.3 / [ 2 * pi ]    = radius  ≈  3.4 mm

 

 

cool cool cool

CPhill  Mar 23, 2017

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