it is the length of a circle from left to right you basically double the radius which is half of the diameter.
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Only circles (or spheres) have a diameter
The diameter of a circle is twice the radius.
Circles have a diameter, not length. The diameter of a US cent is 19 mm.
Yes, the radius is half the diameter. (Eg, if the DIAMETER is 6, the RADIUS would be 3).
Circles have diameters, rectangles have diagonals.