1.

If R and r denote the external and internal radii of a hollow right circular cylinder respectively and h is the height, then the total surface area becomes

A. 2π(R+r)(R+h-r)
B. 2π(R+r)(R+h)
C. 2π(R+r)
D. 10π(R+r)
Answer» B. 2π(R+r)(R+h)


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