-> From memory,  was there any triplet as memorable and useful as the  
-> basic 3-4-5 ?  AFAICS,  3-4-5 has an honourable history in the  
-> buildig trade that stretches right back to ancient Egypt and  
-> beyond... 
  
Math teachers (I used to be one) use a few triples to make up 
questions. 3,4,5 is common. So are 5,12,13 and 8,15,17. I used to tell 
my students to look for these ratios in questions. They could save 
themselves a lot of work if they spotted them. 
  
                           dow 
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