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

Find the diameter -GMATPREP

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 416
Joined: Wed Oct 03, 2007 9:08 amFollowed by: 1 member
Thanked: 10 times
by gmatrant » Wed Nov 14, 2007 1:05 am
Find the diameter
OA is 11
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Problem Solving |
Junior | Next Rank: 30 Posts
Posts: 13
Joined: Thu Oct 11, 2007 2:43 pm

by swle24 » Wed Nov 14, 2007 6:04 am
since it is an equidrateral ABC length is 2/3 of its circumference. that means 2/3 πd=24 so d=36/π where π is 3.14 hence d=11
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 416
Joined: Wed Oct 03, 2007 9:08 amFollowed by: 1 member
Thanked: 10 times

by gmatrant » Wed Nov 14, 2007 7:54 am
swle24 wrote:since it is an equidrateral ABC length is 2/3 of its circumference. that means 2/3 πd=24 so d=36/π where π is 3.14 hence d=11
thanks for the solution..
Is this based on some properties, haven't come across this before.
Is there something for an isoceles triangle as well?
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 468
Joined: Sat Mar 03, 2007 10:17 pm
Thanked: 5 times

by moneyman » Thu Nov 15, 2007 6:36 am
Hi swle24 can you pls explain how an equilateral triangle covers 2/3 of the circumferecne?? This problem has been in my mind for a very long time!! An explanation would be very helpful!! Thanks
Maxx
Top
Join the discussion
Newbie | Next Rank: 10 Posts
Posts: 8
Joined: Fri Sep 21, 2007 9:32 am

by nkumar » Fri Nov 16, 2007 4:05 am
No, the reason for it is based on the fact that a chord makes an angle at the centre that is double the one it makes on the circumference. So, the chord BC which makes 60º at circumference (point A) will make 120º at the centre. So the arc BC is making 120º at centre while arc BAC makes 240º.
Therefore, the arc length BAC is (240/360)*pi*d=24
Cheers
Top
Join the discussion