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 →

Geometry

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Sun Oct 19, 2008 6:07 pm
OA is D ???

Circumference of the circle is 2*pi*r

so the radius of each circle is 1

so if see closely .... each side of the triangle is a radius by itself.....

whuch in turn inference for all 1 on each side of the triangle

so using the formula for equilateral triangle area =(root3/4 )*r^2

r=side=radius

root3/4 is the answer

Vishu
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 132
Joined: Tue Oct 07, 2008 4:59 pm
Thanked: 4 times

Area

by vladmire » Tue Dec 09, 2008 7:27 pm
Can anyone clarify this one again. Is each of the sides equal to 1?
circumference = 2(pi)(r)

2pi = 2(pi)r
r= 1 or not?

I see that each side of the triangle is equal to the radius of the circle so what is the radius of the circle? once I get the radius can I use a=1/2bh?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 708
Joined: Sun Jun 01, 2008 4:59 amFollowed by: 1 member
Location: USA
Thanked: 13 times

by niraj_a » Tue Dec 09, 2008 7:54 pm
D

triangle is an equilateral triangle.

formula for the area of an equilateral triangle = ( (Base)^2 * sqrt (3) ) / 4

AB = base = radius

circumference = 2PiR

so 2PiR = 2Pi
so R = 1

then just plug 1 into the area formula above. done.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 132
Joined: Tue Oct 07, 2008 4:59 pm
Thanked: 4 times

review

by vladmire » Thu Jan 01, 2009 11:04 am
I was going back over this problem, but is the answer square root (3)/4? thats not an answer choice is it?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1578
Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members
Thanked: 82 times
GMAT Score:720

by maihuna » Thu Jan 01, 2009 12:08 pm
by construction its an equilateral triangle....of length radius of the circle...circ,ference is 2PIr = 2PI so r =1.
If u know the formula of equilateral triangle: (3^1/2)/4*s^2 so result will be (3^1/2)/4
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1578
Joined: Sun Dec 28, 2008 1:49 amFollowed by: 9 members
Thanked: 82 times
GMAT Score:720

by maihuna » Thu Jan 01, 2009 12:10 pm
are.......1/2bh is only for right angle triangle boss....beware...general triangle is HERRON's formula...remember s(s-a)(s-b)(s-c)..bla bla
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1