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2016-01-17T20:23:39+05:30
GIVEN perimeter of 1st traiangle =30
             perimeter of 2nd triangle=20
             side of first triangle =12cm
              
∴side of 2 nd triangle =30÷20=12÷x(let x be  corresponding side of 2 nd triangle) 
          ∴ cross multiply you get side of 2 nd triangle=8cm
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