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GMAT_700
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A geometry question from GATMPerp 07 May 2008, 16:46
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If you know how to solve the following problem, please explain your answer. Thanks!



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jb32
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A geometry question from GATMPerp 07 May 2008, 16:59
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Angle ABC of an equilateral triangle is 60 degrees or 1/3 of the total degrees in a triangle (all of the angles in a traingle add up to 180). Therfore you know the length of arc AC is 1/3 the total circumfrence of the circle, making the other part of the circle, ARC ABC = 2/3 the circumference of the circle. The distance of arc ABC = 24. From there you can set up an equation to solve if you need to:

2/3(Circumference) = 24
Circumference = 36

The formula to find the circumference is (pie)D = Circumference. Substitue in 36 and divide by pie. This should give you just about 11.
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GMAT TIGER
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A geometry question from GATMPerp 07 May 2008, 22:15
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GMAT_700
If you know how to solve the following problem, please explain your answer. Thanks!
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2/3 (2pi r) = 24
r = 18/pi
d = 2(18/pi) = 11 approx.
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gmatnub
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A geometry question from GATMPerp 07 May 2008, 23:22
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I guess most people here are gmatPERPs because of their obsession with the gmat, and most try to get their hands on the newest and most fresh official gmat questions.
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A geometry question from GATMPerp 08 May 2008, 05:43
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GMAT_700
If you know how to solve the following problem, please explain your answer. Thanks!
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2/3pi*X=24

X=36/pi

x=~12

Closest answer is 11.


C
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RyanDe680
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A geometry question from GATMPerp 08 May 2008, 09:57
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what is this forumla called?
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FN
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A geometry question from GATMPerp 09 May 2008, 08:44
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my way is more or less the same..

i know the triangle is equilateral..so if the perimeter of this is 24..then each side must be 8..

ok..now you really have to look at the diagram...cus thats important..i could arrange a equilateral triangle inside a circle where all sides can be equal to the radius..

anyway..looking at the figure..i see that one lenght is 8..now if i were to draw an isso triangle along the radius with the longer side being 8..i know that isso triangles have sides in the following proportion x:x:sqrt(2)x..

i know the longer side sqrt(2)x=8..lets find x or better yet 2x..since we are looking for diameter..

x=16/sqrt(2) =11.3

11 it is..



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