| by Serhiy Grabarchuk, Jr. |
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Suppose you have a ruler but its
precise length is unknown. At least one of the ruler’s edges is
straight, which allows drawing straight lines. There are only two
marks on the ruler – on the straight side of the ruler. And it is
known the distance between them is exactly 2 cm (2 in).
Now, using this ruler, a pencil and a piece of paper (neither the
pencil nor the piece of paper can be used as helpers in any
measurements except that you draw with the pencil on the piece of
paper), can you draw on the paper a segment of exactly 1 cm (1 in)?
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