Draw a rhombus ABCD such that BD = 5.6 cm and AC = 6.6 cm.

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Steps of construction:
I.    Draw a line segment AC = 6.6 cm.
II.   Draw perpendicular bisector XY of AC, which meets AC at M.
III.  With centre M and radius  = 
i.e.  2.8 cm, draw arcs to intersect XY at B and D.
IV.  Join AB, BC, CD and AD.
Thus, ABCD is the required rhombus.