C) J( x ) 3) A trough for holding water is formed by taking a piece of sheet metal 60 cm wide and folding the 20 cm on either end up as shown below. Determine the angle 0 that will maximize the amount of water that the trough can hold. *might need to look up a trig identity. (A /4 T /2) 20 cm 20 cm - - - 20 cm