Euclid Book 1 - Proposition 22
Construct a triangle from three lines

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Construction: To construct a triangle out of three straight lines which equal three given straight lines: thus it is necessary that the sum of any two of the straight lines should be greater than the remaining one.

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There are lines AB, CD, EF, where AB + CD > EF, AB + EF > CD, CD + EF > AB

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© Jo Edkins 2010 - Return to Euclid index