Asked by kelvin
                please guys help me this question, how to solve it.
Calculate the total surface area of a hollow cylinder whose radius is 15 cm and height is 20 cm.
What formula can be applied between
(a) SA = 2pie*r*h + 2pie*r^2
(b)SA = 2pie*r*h
State the reason why you choose (a) or (b).
            
        Calculate the total surface area of a hollow cylinder whose radius is 15 cm and height is 20 cm.
What formula can be applied between
(a) SA = 2pie*r*h + 2pie*r^2
(b)SA = 2pie*r*h
State the reason why you choose (a) or (b).
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