The fuel rods for a certain type of nuclear reactor are bundled into a cylindrical shell. Consider this cross-section showing 19 identical fuel rods:

a) If the diameter of the one rod is 2.8cm, calculate the shaded area of the cross-section.

b) If the length of the cylindrical shell is 72.50 cm, what is the combined total volume of the all the fuel rods?

c) What is the lateral surface area of the cylindrical shell?

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