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howelcar005

Answer:

66 millimeters

Step-by-step explanation:

Well, to find the circumference of something, you have to multiply the diameter by pi, which is 3.14. this will give you 6.9 and a lot of other numbers. Round it up and you get 66

Answer:Radius=diameter/2=21/2=10.50mm

Circumference=2*pi*r=2*3.14*10.50=65.94

Rounding to the nearest millimeter, circumference= 66 mm

Step-by-step explanation:

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