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Step-by-step explanation:
if AD and BE are both perpendicular then they will be parallel to each other... hence by Thales theorem...
let X = BC
CE/DE = CB/AB
hence.... 5/7 = x/3.5
then.... X = 5×3.5/7 = 2.5 cm
X = BC = 2.5 cm
hope it helps you......
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