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What is the surface area of a right circular cylinder with a radius of r and a height that is 1.5 times its diameter?
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A.6$$\pi$$$$r^2$$+4$$\pi$$r
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B.7$$\pi$$$$r^2$$
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C.8$$\pi$$$$r^2$$
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D.3$$\pi$$$$r^2$$+2$$\pi$$$$r^{2}$$
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E.3$$\pi$$$$r^3$$+4$$\pi$$r
C显示答案
