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

In the figure above, square \(ABCD\) has an area of \(25.\) What is the area of the circle with center \(O?\)

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
Legendary Member
Posts: 1622
Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members
by Gmat_mission » Thu Sep 10, 2020 1:06 am
Timer
00:00
Your answer
Difficulty–

right wrong

Pick an answer to see how members did

2018-11-13_1131.png
In the figure above, square \(ABCD\) has an area of \(25.\) What is the area of the circle with center \(O?\)

A. \(\dfrac{5\sqrt2\pi}2\)

B. \(\dfrac{25\pi}4\)

C. \(\dfrac{25\pi}2\)

D. \(5\sqrt2\pi\)

E. \(25\pi\)

Answer: C

Source: Princeton Review
You do not have the required permissions to view the files attached to this post.
Top
Join the discussion
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 59
Joined: Tue Oct 01, 2019 5:49 am

Re: In the figure above, square \(ABCD\) has an area of \(25.\) What is the area of the circle with center \(O?\)

by gentvenus » Thu Sep 10, 2020 4:33 am
I keep getting B for some reason...
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Thu Sep 10, 2020 6:03 am

Re: In the figure above, square \(ABCD\) has an area of \(25.\) What is the area of the circle with center \(O?\)

by ravinikhil » Thu Sep 10, 2020 6:16 am
ABCD is a square with area 25.
now let side length be a.
hence a^2 = 25
ie a = 5.
Now, a= AD = 5.
Imagine drawing a line from O to X which is on AD and bisects it in half.
Now consider AOX triangle
here AX is 5/2 in length, since ABCD is a square , hence angle OAD will be 45 degrees.
Now OA cos 45 = AX. { understood right }
OA / sqrt ( 2 ) = 5/2
OA = 5 * sqrt (2) / 2

Area of the circle is pie radius^2.
radius is OA.
hence the overall area is = pie * 25 / 2
Top
Join the discussion