## Sunday, October 4, 2009

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- Ariel Goldberg
- My name is Ariel Goldberg and I have been a GMAT tutor for eight years. I have taken the GMAT more than twenty times and scored into the 99th percentile; I like to share my GMAT knowledge with everybody. One of the things I like is to write GMAT quant questions that do reflect the changes in the test. The questions sold by some prep services are outdated in that they reflect the GMAT of three or four years ago, before Pearson took over. So that is where I come in, I provide people with good, real-looking GMAT questions.

OA C...60 Deg

ReplyDeleteWow this is a toughie.. Ari, you are good!

ReplyDeleteRicardo

A(0,1,0)

ReplyDeleteC(1,0,0)

B(1,1,1)

AC= (-1,1,0)

BC = (0,1,1)

CosC = 1/sqrt(2)^2 = 1/2

C = 60

The other way: notice that it is equilateral triangle formed by diagonals. Hence, 60

Good job guys. And blaoism, yes, the best way of looking at it is to see that ABC is equilateral so the angle will equal 60. And yeah, this is a real tough guy, until someone tell you how to do it! Then it iseems obvious, right?

ReplyDeleteEasier method:

ReplyDeleteLime from A to B is diagonal of one side of the cube.

Same with BC and AC. Since all the faces of the cube have similar dimension, all the sides of the triangle, AB, BC, and CA are having same length.

If all the sides are same, then it should be equilateral triangle.

-Bharath S H

ha

Really, these quotes are the holistic approach towards mindfulness. In fact, all of your posts are. Proudly saying I’m getting fruitfulness out of it what you write and share. Thank you so much to both of you.

ReplyDeleteGMAT Training in Chennai

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