Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

circle question

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 98
Joined: Mon Nov 23, 2009 2:30 pmFollowed by: 1 member
Thanked: 26 times
by ace_gre » Fri Jan 08, 2010 10:25 pm
Can anyone help solve this question ? Cannot seem to figure this out! Thanks

OA is B
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Problem Solving |
User avatar
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Mon Dec 14, 2009 4:15 am

by Lattefah84 » Sat Jan 09, 2010 1:10 am
As I look at this picture, I would say x is 15. But I wouldn't know what is official method to solve this. This angle just looks too tiny for 30.

And what is OA?
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 124
Joined: Tue Dec 22, 2009 8:32 am
Location: Karjat
Thanked: 3 times

by linkinpark » Sat Jan 09, 2010 8:25 am
30 is my take
AB = BC = CD if you notice these are radii of circle so traingle ABC and ACD are equilaterals hence angle BAC = CAD = 60 and their sum = 120, now triangle ABD is iscosceles coz two sides are radii hence other angle will be x and 2x=60 so x=30

hope its clear
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 87
Joined: Wed Jan 06, 2010 8:16 pm
Location: Chandigarh, INDIA

by onedayi'll » Sat Jan 09, 2010 8:58 am
30 degree
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 98
Joined: Mon Nov 23, 2009 2:30 pmFollowed by: 1 member
Thanked: 26 times

by ace_gre » Sat Jan 09, 2010 11:10 am
Thanks for all your responses..

@ linkinpark, one question... How do we know that BD is the bisector? From your explanation I see that ABC=60 degree, but how do we know that it is 2x? Thanks!
Top
Join the discussion

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16206
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Sat Jan 09, 2010 12:23 pm
Image
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
User avatar
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Mon Dec 14, 2009 4:15 am

by Lattefah84 » Sat Jan 09, 2010 12:33 pm
ace_gre wrote:Can anyone help solve this question ? Cannot seem to figure this out! Thanks

OA is B
but the x arc at your picture is not the same as on Brent Hanneson's picture. OA is really 30 degrees???
Top
Join the discussion

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16206
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Sat Jan 09, 2010 12:35 pm
Lattefah84 wrote:
ace_gre wrote:Can anyone help solve this question ? Cannot seem to figure this out! Thanks

OA is B
but the x arc at your picture is not the same as on Brent Hanneson's picture. OA is really 30 degrees???
I'm not sure what you mean. I used the same diagram in my solution.
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
User avatar
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Mon Dec 14, 2009 4:15 am

by Lattefah84 » Sat Jan 09, 2010 1:20 pm
Brent Hanneson wrote:Image
I think the area where arc x was marked is not the same where you marked it. I think of the arc contained of straight black line and full red line on the left from straight black line. If x is the arc as marked, it's too narrow for 30 degrees.
Top
Join the discussion

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16206
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Sat Jan 09, 2010 1:52 pm
Angle x is the same as angle ABD
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
Newbie | Next Rank: 10 Posts
Posts: 6
Joined: Fri Jan 08, 2010 7:01 am
Thanked: 1 times

by Jmx » Sat Jan 09, 2010 6:10 pm
I think Brent's pictures explain it greatly, but they can be confusing as they are not drawn to scale (same in the problem)... The bisector in an equilateral triangle should intersect the Base at its middle.
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 233
Joined: Mon Jun 09, 2008 1:30 am
Thanked: 5 times

by blaster » Mon Jan 11, 2010 5:00 am
x=30
Top
Join the discussion