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the total surface area of this cylinder
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27 Aug 2022, 04:00
27 Aug 2022, 04:00
Expert Reply
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Question Stats:
91% (01:26) correct
8% (01:38) wrong based on 12 sessions
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Quantity A |
Quantity B |
the total surface area of this cylinder |
the total surface area of a cube with edges e = 9 cm |
A. Quantity A is greater
B. Quantity B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
Part of the project: GRE Quantitative Comparison GEOMETRY+Tricky Questions - Special Summer Edition (2022)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials (2022)
GRE Geometry Formulas
GRE - Math Book
Re: the total surface area of this cylinder
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27 Aug 2022, 04:19
27 Aug 2022, 04:19
1
TSA of cylinder with radius r = 7 and height h = 8 is equal to 2*(pi)r^2 + 2(pi)rh
Hence, Option A= 2(pi)49 + 2(pi)56= 2(pi)*105 = 210(pi) = 210*3.14 which is greater than 630
Option B on the other hand is TSA of a cube with edge length l = 9 which is calculated by 6*(L^2)= 6*81 = 486
As option A > option B, the answer is Option A.
Hence, Option A= 2(pi)49 + 2(pi)56= 2(pi)*105 = 210(pi) = 210*3.14 which is greater than 630
Option B on the other hand is TSA of a cube with edge length l = 9 which is calculated by 6*(L^2)= 6*81 = 486
As option A > option B, the answer is Option A.
gmatclubot
Re: the total surface area of this cylinder [#permalink]
27 Aug 2022, 04:19
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