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If the area is 25 centimetres, then the length of a single side will be sqrt(25) = 5 centimetres.
As many as you want. The length of the third side can be anything between (25 + 18) and (25 - 18).
25 metres is 25 metres. Simple! If you wanted that length expressed as a fraction of some other measure of length then perhaps you should have said so in the question and mentioned which other length you were interested in.
20
12/25 = 2/y so y = 2*25/12 = 25/6 = 4.166... units.