Need help guys, not understanding this at all. Can anyone help me out? Two sides of a triangle and their included angle are changing with respect to time. The angle increases at the rate of 1 radian/sec, one side increases at the rate of 3ft/sec, and the other side decreases at the rate of 2ft/sec. Find the rate at which the area of the triangle is changing when the angle is 45 degrees, the first is 4 feet long and the second side is 5 feet long. Is the area increasing or decreasing at this instant?