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How to construction a triangle given its peremeter and its two base angles

eg:- To construct a triangle with perimeter 80m and base angles 500 and 600.
  Step1 : Draw a line of length 12m.
  Step2 : Bisect both angles.
  Step3 : Draw angles on the perimeter.
  Step4 : Bisect BA and AC.
  Step5 : Where the bisector intersect the perimeter ,label D,E.
  Step6 : Draw triangle ADE.


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