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# A metal right circular cylinder is 20 centimeters tall, has a base wit

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Math Expert
Joined: 02 Sep 2009
Posts: 55266
A metal right circular cylinder is 20 centimeters tall, has a base wit  [#permalink]

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26 Nov 2018, 00:36
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Difficulty:

35% (medium)

Question Stats:

67% (01:22) correct 33% (01:25) wrong based on 32 sessions

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A metal right circular cylinder is 20 centimeters tall, has a base with diameter 8 centimeters, and is open at both ends. Which of the following is closest to the outside surface area of the cylinder, in square centimeters?

A. 450
B. 475
C. 500
D. 525
E. 550

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Re: A metal right circular cylinder is 20 centimeters tall, has a base wit  [#permalink]

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26 Nov 2018, 22:33
Bunuel wrote:
A metal right circular cylinder is 20 centimeters tall, has a base with diameter 8 centimeters, and is open at both ends. Which of the following is closest to the outside surface area of the cylinder, in square centimeters?

A. 450
B. 475
C. 500
D. 525
E. 550

formula will be :
4*pi*r+ pi*r*h
4*3.14*4+3.14*4*20
= 502 ~ 500 option C
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Joined: 02 Oct 2018
Posts: 57
Re: A metal right circular cylinder is 20 centimeters tall, has a base wit  [#permalink]

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29 Nov 2018, 06:15
Archit3110 wrote:
Bunuel wrote:
A metal right circular cylinder is 20 centimeters tall, has a base with diameter 8 centimeters, and is open at both ends. Which of the following is closest to the outside surface area of the cylinder, in square centimeters?

A. 450
B. 475
C. 500
D. 525
E. 550

formula will be :
4*pi*r+ pi*r*h
4*3.14*4+3.14*4*20
= 502 ~ 500 option C

Archit3110

I believe that we are asked to find the curved surface area of the cylinder.

CSA of a cylinder is 2*pi*r*h = 2*3.14*4*20= 502 (approx)
Re: A metal right circular cylinder is 20 centimeters tall, has a base wit   [#permalink] 29 Nov 2018, 06:15
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# A metal right circular cylinder is 20 centimeters tall, has a base wit

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