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18 February, 13:54

The diameter is 40 mm find

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Answers (2)
  1. 18 February, 17:34
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    I'm assuming you want the radius, which is just half of the diameter.

    If you want the area of the circle use the formula: A = πr^2
  2. 18 February, 17:41
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    Assuming you are talking about the diametre of a circle, there are two questions you could be asking:

    Circumference-diametre times pi

    Area-1/2diametre squared times pi
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