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

 It is currently 18 Sep 2018, 22:27

### 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

# A round mirror, radius 5*2^(1/2), is encircled by a frame of uniform .

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 49231
A round mirror, radius 5*2^(1/2), is encircled by a frame of uniform .  [#permalink]

### Show Tags

02 Sep 2018, 23:25
00:00

Difficulty:

25% (medium)

Question Stats:

83% (00:58) correct 17% (00:38) wrong based on 12 sessions

### HideShow timer Statistics

A round mirror, radius $$5\sqrt{2}$$, is encircled by a frame of uniform width. If the circumference of the frame is 20π, what is the area of the frame?

A. $$375\pi$$

B. $$200\pi$$

C. $$100\pi$$

D. $$75\pi$$

E. $$50\pi$$

_________________
SVP
Joined: 08 Jul 2010
Posts: 2298
Location: India
GMAT: INSIGHT
WE: Education (Education)
Re: A round mirror, radius 5*2^(1/2), is encircled by a frame of uniform .  [#permalink]

### Show Tags

03 Sep 2018, 00:45
Bunuel wrote:
A round mirror, radius $$5\sqrt{2}$$, is encircled by a frame of uniform width. If the circumference of the frame is 20π, what is the area of the frame?

A. $$375\pi$$

B. $$200\pi$$

C. $$100\pi$$

D. $$75\pi$$

E. $$50\pi$$

Circumference of Frame = 2πR = 20π

i.e. Radius of frame = R = 10

Area of Frame = Area of bigger circle - Area of smaller circle = π(R^2-r^2) = π(10^2 - 5√2^2) = π(100-50) = 50π

Attachments

Circle.png [ 3.64 KiB | Viewed 143 times ]

_________________

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

22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

Re: A round mirror, radius 5*2^(1/2), is encircled by a frame of uniform . &nbs [#permalink] 03 Sep 2018, 00:45
Display posts from previous: Sort by

# Events & Promotions

 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®.