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

 It is currently 22 Oct 2019, 08:05

### 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

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

# The ratio of the area of circle A to the area of circle B is 4:1

Author Message
TAGS:

### Hide Tags

Senior Manager
Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 419
The ratio of the area of circle A to the area of circle B is 4:1  [#permalink]

### Show Tags

29 Oct 2018, 03:48
1
Top Contributor
00:00

Difficulty:

15% (low)

Question Stats:

73% (00:55) correct 27% (01:20) wrong based on 28 sessions

### HideShow timer Statistics

The ratio of the area of circle A to the area of circle B is 4:1. What is the ratio of the circumference of circle A to the circumference of circle B?

A. 1:3

B. 1:1

C. 2:1

D. 4:1

E. 8:1

_________________
NUS School Moderator
Joined: 18 Jul 2018
Posts: 1020
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: The ratio of the area of circle A to the area of circle B is 4:1  [#permalink]

### Show Tags

29 Oct 2018, 05:39
1
$$\frac{πr_A^2}{πr_B^2} = \frac{4}{1}$$

$$\frac{r_A}{r_B} =\frac{2}{1}$$

or $$r_A = 2r_B$$.

Circumference = $$\frac{2πr_A}{2πr_B}$$ = $$\frac{2}{1}$$

_________________
Press +1 Kudos If my post helps!
CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2978
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Re: The ratio of the area of circle A to the area of circle B is 4:1  [#permalink]

### Show Tags

29 Oct 2018, 05:58
Baten80 wrote:
The ratio of the area of circle A to the area of circle B is 4:1. What is the ratio of the circumference of circle A to the circumference of circle B?

A. 1:3

B. 1:1

C. 2:1

D. 4:1

E. 8:1

Ratio of Area of two similar figures = (Ratio of corresponding dimension$$)^2$$

i.e. Ratio of Radius of two circles$$^2$$ = 4/1

i.e. Ratio of Radius of two circles= 2/1

_________________
Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION
Re: The ratio of the area of circle A to the area of circle B is 4:1   [#permalink] 29 Oct 2018, 05:58
Display posts from previous: Sort by