√3 IS 1.732, so it is just beside 1 on number line ...!
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1.Draw a line say 1 unit AB.
  on b draw perpendicular that is of legth = 1 unit  say point c.
join ac..with radius ac, draw an arch on pt ait will be root2. mark it as d.then draw a perpendicular on d = 1 unit., join ad and again draw an arc which will be root 3
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