In the plane it is the locus of all points equi-distant from a point in the plane. Show a very thin slice perpendicular to the axis of any right cylinder. Look end on at a straw.
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A comfy place to sit and read the newspapers. An out-house with running water.
Error coins need to be seen, take it to a collector or dealer. NOTE: coins are struck, not printed.
When a number is given followed by K it means the weight of the gold. Most have 10K, 12K, 14k and 18k. I have never seen 40k.
There doesn't seem to be any real antonym for the word superimposed. It would make sense to use the word supraimposed, (as supra means earlier) however I have never seen that word used.
It is a symmetric function which is fully described by two parameters. It is called bell shape but I have never seen a bell whose rime is infinitely far away from its apex. The area under the curve is equal to 1.