BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

the circle C

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760
by sanju09 » Tue May 26, 2009 12:48 am
What is the circumference, in inches, of circle C?

(1) When a circle, which is ½ in radius to circle C is removed from the circle C, the remaining area is 7.45 square inches.

(2) The ratio of the surface area of the sphere (same in radius to circle C) to the area of the circle C is 4:1.



MBM
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 13
Joined: Fri May 01, 2009 12:15 pm
Thanked: 1 times

by eyoussef » Tue May 26, 2009 1:04 am
I think the answer is A

(1)the satement says that the big cirlce has radius r and the small circle has radius 1/2 r
thus area of big circle - area of small cirlce = pi*r^2 - pi*(1/2*r)^2
3/4*pi^2 = 7.45, r could be obtained from the equation SUFFICIENT

(2) this statement means :
(4*pi*r^2)/Pi*r^2 = 4/1
INSUFFICIENT

some one please correct me if i'm wrong
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Mon May 25, 2009 9:40 pm
Thanked: 1 times

by caprion » Tue May 26, 2009 8:23 am
I agree with eyoussef :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 32
Joined: Fri Feb 27, 2009 8:38 pm

by TryHarder » Tue May 26, 2009 12:05 pm
Just to add: 2. just restates a universal fact hence would not help.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1