Last visit was: 23 Apr 2026, 14:06 It is currently 23 Apr 2026, 14:06
Home
Messages
Tests
Schools
Events
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
Jennif102
User avatar
Joined: 19 Sep 2005
Last visit: 28 May 2006
Posts: 71
Own Kudos:
23
Posts: 71
Kudos: 23
OG version 11, Word Problem question 380 19 Oct 2005, 12:33
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Could someone please explain to me question 380 on pg. 126 in the Official Guide? I have no idea how in the world they get 70 degrees for the corresponding arc to the angle that is 35 degrees.
It's driving me nuts! Thx in advance



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
yb
User avatar
Joined: 05 Oct 2005
Last visit: 01 Nov 2010
Posts: 390
Own Kudos:
15
Posts: 390
Kudos: 15
OG version 11, Word Problem question 380 19 Oct 2005, 12:42
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I'm having trouble with that one too. Thanks for bringing it up. The reference you made is from OG version 10. It is 206 on p. 180 in OG 11. It has to do w/ the concept that "Minor arcs always have twice the measure of their inscribed angles". I think I'm as confused as you are on this one.
Could someone please elaborate on this rule and explain the solution.

Thanks
User avatar
chriswil2005
User avatar
Joined: 04 May 2005
Last visit: 17 Jun 2010
Posts: 93
Own Kudos:
29
Location: Chicago
Posts: 93
Kudos: 29
OG version 11, Word Problem question 380 19 Oct 2005, 12:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Could you post question and diagram. I don't have the book in front of me, but I think I know which question you are talking about.
User avatar
nero44
User avatar
Joined: 04 Oct 2005
Last visit: 28 May 2006
Posts: 134
Own Kudos:
399
Posts: 134
Kudos: 399
OG version 11, Word Problem question 380 19 Oct 2005, 12:50
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I think it's the question discussed here:

https://www.gmatclub.com/phpbb/viewtopic.php?t=20746
avatar
Titleist
avatar
Joined: 14 Oct 2003
Last visit: 14 Dec 2005
Posts: 202
Own Kudos:
176
Location: On Vacation at My Crawford, Texas Ranch
Posts: 202
Kudos: 176
OG version 11, Word Problem question 380 19 Oct 2005, 12:56
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Jennif102
Could someone please explain to me question 380 on pg. 126 in the Official Guide? I have no idea how in the world they get 70 degrees for the corresponding arc to the angle that is 35 degrees.
It's driving me nuts! Thx in advance
Show more



Jenny real simple. Refer to the crudely drawn diagram below. :roll:

Rembember that any triangle that is inscribed in a circle is a right triangle (has one 90 degree angle). Thus if you draw out an inscribed triangle and split it in half (meaning draw another radius to form another triangle) you have 2 isoceles triangles. From there you can see why 70 must be the degree measure. It's useful to remember that a vertice inside a vertice in an inscribed triangle is always 2x the value of the outside vertice. when given problems like these, it's useful to draw extra lines to fill in the gaps. hope this helps you jenni.
Attachments

circle.JPG
circle.JPG [ 10.2 KiB | Viewed 1299 times ]

User avatar
Jennif102
User avatar
Joined: 19 Sep 2005
Last visit: 28 May 2006
Posts: 71
Own Kudos:
23
Posts: 71
Kudos: 23
OG version 11, Word Problem question 380 19 Oct 2005, 14:50
Kudos
Add Kudos
Bookmarks
Bookmark this Post
It really would have been nice if the official guide had explained a bit more than "Since this angle is 35, this arc is 70"



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!