The surface area of a cylinder is 42π cm².
It is given that the formula for the surface area of cylinder is: 2πr(r + h)
where,
r = 3cm (radius of the cylinder)
h = 4cm (height of the cylinder)
Surface area of cylinder = 2π × 3 × (3 + 4)
= 2π × 3 × 7
= 2π × 21
= 42π cm²
So, the correct option is fourth, 42π cm².
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