That's correct, but it is usually said to be half of the diameter.
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The radius of a circle is half of the diameter. Radius= Diameter divided by 2
to determine the radius if you only have the diameter, you divided the diameter by 2. then there you have it ! you have the radius !
Diameter divided by 2 equals radius r=d/2 For example, if the radius was 3.5, the diameter would be 7.
circumference: Pi(3.14) x radius squared Diameter: radius squared radius: diameter divided by 2
The radius is half the diameter. Therefore, 770 divided by 2 equals 385mm