Answer: Choice D
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Explanation:
The formula for the surface area of a cylinder is
[tex]SA = 2\pi*r^2 + 2\pi*r*h[/tex]
We then replace r with 10 and h with 25. Keep in mind that the diameter is 20 mm, so the radius is half that at 10 mm.
So that's how we get to
[tex]SA = 2\pi*10^2 + 2\pi*10*25[/tex]
