Monday, 26 December 2011

Geometry - 19

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

To enter your answer, click on comments below:

1 comment:

  1. Ans is (2)-7
    if 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...