Ah, the distance across the end of a pencil is what we call the diameter. It's the measurement from one side of the pencil to the other side, passing through the center. Just imagine a little circle that fits perfectly on the end of your pencil – that's the diameter!
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If you know the radius place the compass point on a ruler and the pencil end the radius distance away from it. Then put the point on the paper and spin to draw the circle. If you know the diameter divide by two to get the radius and place the compass point on a ruler and the pencil end the radius distance away from it. Then put the point on the paper and spin to draw the circle.
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the distance across the middle is the radius and whole distance across it is the diameter
Most of the pencils which I own have no metal at the end.
The distance across the diamond is 114.6 feet.