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Similar Triangles

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Senior Manager
Status: Yeah well whatever.
Joined: 18 Sep 2009
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Kudos [?]: 78 [0], given: 17

Location: United States
GMAT 1: 660 Q42 V39
GMAT 2: 730 Q48 V42
GPA: 3.49
WE: Analyst (Insurance)
Similar Triangles [#permalink]

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02 May 2010, 16:56
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I thought this one was a doosey if you don't know the rules to triangles very well. Tell me what you think.

Two similar triangles have areas in the ratio of 9:1. What is the ratio of these triangles' perimeters?
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Kudos [?]: 78 [0], given: 17

CEO
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2761

Kudos [?]: 1887 [1], given: 235

Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Re: Similar Triangles [#permalink]

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02 May 2010, 17:03
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vannbj wrote:
I thought this one was a doosey if you don't know the rules to triangles very well. Tell me what you think.

Two similar triangles have areas in the ratio of 9:1. What is the ratio of these triangles' perimeters?

ratio of square of sides = ratio of area = 9/1

=> ratio of sides = 3/1 , perimeter ratio= sum of sides of 1st/sum of sides of 2nd

A/a = B/b = C/c = 3/1 => ratio of perimeter = (A+B+C)/(a+b+c) = 3
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Senior Manager
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Kudos [?]: 89 [0], given: 28

Schools: DukeTuck,Kelogg,Darden
Re: Similar Triangles [#permalink]

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03 May 2010, 10:55
vannbj wrote:
I thought this one was a doosey if you don't know the rules to triangles very well. Tell me what you think.

Two similar triangles have areas in the ratio of 9:1. What is the ratio of these triangles' perimeters?

Ratio of the sides will be 3:1 so same is true for the perimeter.

its 3:1.
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Manager
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Schools: CBS
Re: Similar Triangles [#permalink]

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03 May 2010, 10:57
vannbj wrote:
I thought this one was a doosey if you don't know the rules to triangles very well. Tell me what you think.

Two similar triangles have areas in the ratio of 9:1. What is the ratio of these triangles' perimeters?

3:1. Just remember the following formula:

Area of triangle A/Area of triangle B = Square of side a/Square of side b.

You can use this formula to answer questions asked on either end (sides or areas)

Kudos [?]: 4 [0], given: 0

Re: Similar Triangles   [#permalink] 03 May 2010, 10:57
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