GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 19 Sep 2018, 08:00

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

If the area of a circle in square feet equals its radius in feet, then

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

DS Forum Moderator
User avatar
D
Joined: 27 Oct 2017
Posts: 716
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Premium Member CAT Tests
If the area of a circle in square feet equals its radius in feet, then  [#permalink]

Show Tags

New post 02 Jul 2018, 10:03
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

64% (01:24) correct 36% (01:26) wrong based on 14 sessions

HideShow timer Statistics

If the area of a circle in square feet equals its radius in feet, then the circle's radius, in feet, is closest to
A) 0.25
B) 0.32
C) 0.45
D) 0.5
E) 0.65

_________________

Win GMAT CLUB Tests - Weekly Quant Quiz Contest
SC: Confusable words

All you need for Quant, GMAT PS Question Directory,GMAT DS Question Directory
Error log/Key Concepts
Combination Concept: Division into groups
Question of the Day (QOTD)
Free GMAT CATS

Senior SC Moderator
avatar
V
Joined: 22 May 2016
Posts: 1973
Premium Member CAT Tests
If the area of a circle in square feet equals its radius in feet, then  [#permalink]

Show Tags

New post 02 Jul 2018, 10:52
gmatbusters wrote:
If the area of a circle in square feet equals its radius in feet, then the circle's radius, in feet, is closest to
A) 0.25
B) 0.32
C) 0.45
D) 0.5
E) 0.65

Using this approximation: \(\pi\approx{3.14}\approx{\frac{22}{7}}\)

Area of a circle = radius of a circle

\(A =\pi r^2= \pi * r*r\)
\(A=r\)
\(\pi*r*r=r\)
Divide by \(r\)
\(\pi*r=1\)
We need the length of the radius:
\(r =\frac{1}{\pi}\approx{\frac{1}{3.14}}\approx{.32}\)

Answer B

Or find radius this way (whatever is easier):
\(r =\frac{1}{\pi}\approx{\frac{1}{\frac{22}{7}}}=(1*\frac{7}{22})\approx{.32}\)

_________________

In the depths of winter, I finally learned
that within me there lay an invincible summer.

-- Albert Camus, "Return to Tipasa"

Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4019
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: If the area of a circle in square feet equals its radius in feet, then  [#permalink]

Show Tags

New post 02 Jul 2018, 11:32
gmatbusters wrote:
If the area of a circle in square feet equals its radius in feet, then the circle's radius, in feet, is closest to
A) 0.25
B) 0.32
C) 0.45
D) 0.5
E) 0.65


\(r\) = \(πr^2\)

Or, \(1 = \frac{22r}{7}\)

Or, \(r = \frac{7}{22}\)

Or, r ~ 0.32 , Answer must be (B)
_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

Re: If the area of a circle in square feet equals its radius in feet, then &nbs [#permalink] 02 Jul 2018, 11:32
Display posts from previous: Sort by

If the area of a circle in square feet equals its radius in feet, then

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.