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The expression that would provide the approximate surface area of the cylinder is 2πrh+2πr^2, where h = 8 and r = 6.
Substituting the values, the expression simplifies to 2π(6)(8) + 2π(6)^2.
Calculating further, we get (12π)(8) + (72π).
The approximate surface area is therefore 96π + 72π = 168π.