Mathematics
Answer
Steps of construction:
Draw a line segment BC = 6 cm.
At B draw BX such that ∠CBX = 45°.
With B as center and radius equal to 6 cm draw an arc cutting BX at A.
Using the same radius taking C and A as centers cut off arcs, which will intersect at D.
Join CD and AD.

Hence, ABCD is the required rhombus.