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# what is the difference between D and C?

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Current Student
Joined: 28 Dec 2004
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Location: New York City
Schools: Wharton'11 HBS'12
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what is the difference between D and C? [#permalink]  30 Jun 2008, 15:30
what is the difference between D and C??
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Current Student
Joined: 28 Dec 2004
Posts: 3390
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 183 [0], given: 2

Re: Gprep2-similar shapes [#permalink]  30 Jun 2008, 15:48
so the 4 root sign means a double sqrt root??

i thought you would write a double sqrt as 2sqrt(x)
Current Student
Joined: 28 Dec 2004
Posts: 3390
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 183 [0], given: 2

Re: Gprep2-similar shapes [#permalink]  30 Jun 2008, 16:00
talking about similar shapes..what if i have 2 cubes with say the ratio of their surface area is 2:N, then what would be the ratio of their volumes??

i remember there used to a formula or rule of thumb regarding similar shapes..anyone remember???
Manager
Joined: 13 May 2008
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Re: Gprep2-similar shapes [#permalink]  30 Jun 2008, 19:32
if 2 cubes with side a, b have surface areas in the ration of 2:N,

then, 6 * a^2/ 6 * b^2 = 2/N

a/b = sqrt (2/N)

volumes will be a^3/b^3 = (sqrt(2/N))^3
Director
Joined: 01 Jan 2008
Posts: 513
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Re: Gprep2-similar shapes [#permalink]  30 Jun 2008, 20:42
It should be D

Area of an eq triangle = $$(sqrt(3)/4 )* t^2$$

Area of a square = $$s^2$$
If both are equal

$$s^2=sqrt(3)/4 *(t^2)$$

Which gives

t/s =$$2/(3 ^ (1/4))$$
VP
Joined: 03 Apr 2007
Posts: 1376
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Kudos [?]: 275 [0], given: 10

Re: Gprep2-similar shapes [#permalink]  04 Jul 2008, 20:26
young_gun wrote:
fresinha12 wrote:
what is the difference between D and C??

C is D^2

Agree C is D^2

I get D
Re: Gprep2-similar shapes   [#permalink] 04 Jul 2008, 20:26
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