Posted by carson on Friday, March 14, 2008 at 12:04am.
AB is the hypotenuse, the length of which is sqrt (3^2 + 4^2) = 5 since this is a right triangle. CD is a line from the right angle corner to a point on the hypotenuse. You can gets its length by applying the law of cosines on smaller triangle BCD. You know the lengths of BD and BC and the included angle B cosine (which is 4/5)
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