Answer:
100mm or 31.83mm
Explanation:
If 200mm is the diameter then you should:
200mm/ 2
= 100mm
If 200mm is the circumference, then you should:
200mm/ 2pi
= 200mm/6.28
= 31.83mm
The radius of a circle is determined by definding the diameter by 2. In this case the diameter is 200 mm (r = d/2).
r = 200 / 2
r = 100mm
1mm = 10cm
Therefore the radius of the circle is 100mm or 1000cm.
Hope this helps!
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