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# what is the perimeter of tri PQR 1) measurements of angles

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Intern
Joined: 12 Jul 2007
Posts: 47
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what is the perimeter of tri PQR 1) measurements of angles [#permalink]  21 Jan 2008, 09:19
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Question Stats:

100% (02:17) correct 0% (00:00) wrong based on 0 sessions
what is the perimeter of tri PQR

1) measurements of angles PQR, QRP, RPQ are x deg, 2x deg, 3x deg respectively

2) altitude of tri PQR from Q to PR is 4.

OA is C, but I don't get it.
Director
Joined: 14 Oct 2007
Posts: 759
Location: Oxford
Schools: Oxford'10
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Re: DS perimeter [#permalink]  21 Jan 2008, 09:25
1) tells u only angles - insuff.
2) tells u the "height" (if the traingle is draw with Q at the top)

from 1 you can see that angles form a 30-60-90 triangle i.e a right triangle. and from 2 it shows that PQ is 4. so since its a triangle with ratios 1:sqrt(3):2 perimeter can be calculated

so ans = C
Re: DS perimeter   [#permalink] 21 Jan 2008, 09:25
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