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It is the distance across the entire span of the circle.

Draw a line from one side to the next side like a cord, except directly through the center so that the circle is split in 2 identical semi-circles. The length of this line is the diameter.

The radius of the circle is HALF the diameter so you have the relationships:

D = R/2

or

R = 2D

for R = the radius and D = the diameter

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Q: What is meant by a circle's diameter?
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