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

 It is currently 22 Feb 2019, 16:53

### 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

## Events & Promotions

###### Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT RC Webinar

February 23, 2019

February 23, 2019

07:00 AM PST

09:00 AM PST

Learn reading strategies that can help even non-voracious reader to master GMAT RC. Saturday, February 23rd at 7 AM PT
• ### FREE Quant Workshop by e-GMAT!

February 24, 2019

February 24, 2019

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 53066
In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =  [#permalink]

### Show Tags

09 Oct 2018, 22:45
00:00

Difficulty:

15% (low)

Question Stats:

100% (00:47) correct 0% (00:00) wrong based on 18 sessions

### HideShow timer Statistics

In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =

(A) $$20$$

(B) $$10 \sqrt{2}$$

(C) $$10 \sqrt{3}$$

(D) $$20 \sqrt{2}$$

(E) $$20 \sqrt{3}$$

Attachment:

triangle.jpg [ 12.53 KiB | Viewed 261 times ]

_________________
Intern
Joined: 04 Jun 2015
Posts: 26
Location: India
Concentration: General Management, Operations
GMAT 1: 640 Q49 V28
GPA: 4
WE: Programming (Computer Software)
Re: In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =  [#permalink]

### Show Tags

09 Oct 2018, 23:01
Since A =60 degree
And B = C
i.e. it's an equilateral triangle
Means all sides are equal of ∆ABC

Hence AB =BC=20
OPTION:A

Posted from my mobile device
Director
Joined: 19 Oct 2013
Posts: 508
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
Re: In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =  [#permalink]

### Show Tags

09 Oct 2018, 23:03
Bunuel wrote:

In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =

(A) $$20$$

(B) $$10 \sqrt{2}$$

(C) $$10 \sqrt{3}$$

(D) $$20 \sqrt{2}$$

(E) $$20 \sqrt{3}$$

Attachment:
triangle.jpg

Angle B = Angle C = x

60 + 2x = 180
2x = 120
x = 60

Equal angles correspond to equal lengths.

Since BC = 20 and angle A = 60

Then AB = 20

Posted from my mobile device
VP
Joined: 31 Oct 2013
Posts: 1162
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =  [#permalink]

### Show Tags

10 Oct 2018, 00:44
Bunuel wrote:

In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =

(A) $$20$$

(B) $$10 \sqrt{2}$$

(C) $$10 \sqrt{3}$$

(D) $$20 \sqrt{2}$$

(E) $$20 \sqrt{3}$$

Attachment:
triangle.jpg

A = 60

B = C.

A + B + C = 180

60 + B + B = 180

B = 60

60-60-60 Triangle.

It means all the legs of the triangle must be equal.

BC = 20

AB = 20.

Re: In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =   [#permalink] 10 Oct 2018, 00:44
Display posts from previous: Sort by

# In the figure shown, if ∠A = 60°, ∠B = ∠C, and BC = 20, then AB =

 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®.