On a semicircle with diameter AD, chord BC is parallel to the
diameter. Further, each of the chords AB and CD has length 2, while AD has
length 8. What is the length of BC?
(1)7.5 (2)
7 (3) 7.75 (4) None of these
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Ans is (2)-7
ReplyDeleteif we draw perpendiculars from B and C to AD at suppose P and Q
we calculate AP ans DQ distance and then substract it from AD
use trigonometric knowledge here...