Solution: The diagonal of the rectangle is $ \sqrt6^2 + 8^2 = 10 $ cm. The circumference is $ \pi \times \textdiameter = 10\pi $ cm. The circumference of the throughfall is $\boxed10\pi$ cm.**Question:** A bag contains 7 red marbles and 8 blue marbles. If four marbles are drawn at random, what is the probability that exactly two are red? - Crosslake