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See diagram.

1.  Draw BC = 8 cm horizontally. 
2.  Draw a line at 45 degrees to BC at B.  Draw a long line.
3.  Measure 3.5 cm on this long line.  Mark the point as F.
4.  Now, draw a circular arc with F as a center and radius equal to FC.  This intersects the long inclined line at A.

   Join A and C to get the required ABC.

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