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Area and Volume

SAT Math· difficulty 3/5

A cylinder has radius rr and height h=2rh=2r. What is its lateral surface area in terms of rr?

  • A

    4πr24\pi r^2

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  • B

    4πr4\pi r

  • C

    2πr22\pi r^2

  • D

    2πr2\pi r

Explanation

Lateral =2πrh=2πr(2r)=4πr2=2\pi r h=2\pi r(2r)=4\pi r^2.

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