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Diameter, and radius (please excuse the spelling errors, im only in 6th grade). First, You have a diameter of a circle, for example your diameter is 10 than what is the radius? the radius is half of the diameter so that means that it would be 5.

Now for Circumference, The circumference of a circle is 3.14(pi)D (if the number(s)and the letter are close together that means they are suppose to be multiplied. So if you have a diameter of 8 that means your circumference is 25.12

or you can just do 22 over 7 and multiply it by ? over 1 and see if you can cross out any numbers or( simplify) it then multiply that answer by 2

thats not true,its wrong!!! i'm a teacher an i say other wise

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