ABCD ABCD\,ABCD is a right-angled trapezium. AB AB\,AB is parallel to DC DC\,DC and angle DAB=90∘DAB = 90^\circDAB=90∘.
AB=11AB = 11AB=11 cm, AD=12AD = 12AD=12 cm, and DC=16DC = 16DC=16 cm.
Calculate the length of BCBCBC.
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