pencils can have differend diameters,regular its about 5mm
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A mathematical point is only a location, and has no dimensions. Of course, when you mark the point on paper, it has the same diameter as the lead in your pencil, or the ball on your BIC.
A pencil is usually sharpened to a point.
If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
The piece of lead in a pencil or the pencil.
The radius is one half of the diameter. If the diameter is 20, the diameter is 10.