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First of all, you have to promise us that you're talking about a circle.
We're going to assume that, since you mentioned 'radius'.
The perimeter of a circle ... usually called its 'circumference' ... is (pi) x (the circle's diameter).
The circle's diameter is (2) x (its radius).
Diameter = 200 millimeters
Circumference = (pi) x (200) = 628.319 millimeters (rounded)
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Earn +20 ptsQ: How do you find the perimeter if the radius is 100 millimeters?
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