Answer:
since AC=6cm , m (<acd) =30°
*what is opposite to m(<30°) equal half the hypotenuse *
so, AD= 1/2AC = 3 cm
and since m(<BCD) is 60°
so m(<b) is 30°
so AB= 2AC = 2×6= 12cm
SO, BD= 12-AD = 12-3 = 9 cm
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