ABCD ABCD\,ABCD is a right-angled trapezium where AB AB\,AB is parallel to DC DC\,DC and AD AD\,AD is perpendicular to both parallel sides.

AB=10AB = 10AB=10 cm, BC=17BC = 17BC=17 cm, and DC=18DC = 18DC=18 cm.
Calculate the length of ADADAD.
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