18. A rectangle with length l cm, and height h cm, is inscribed in a circle of radius 10 cm, as shown in the adjacent diagram. The radius of the circle does not change, but the length the rectangle is decreasing at the 10 h constant rate of 8 cm·s-1. Let A be the area of the rectangle (measured in cm?). (a) Show that A = lV400 – (2.

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