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

It is currently 12 Dec 2019, 11:15

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

ABC above is an isosceles triangle in which AB = AC. What is the area

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 59712
ABC above is an isosceles triangle in which AB = AC. What is the area  [#permalink]

Show Tags

New post 13 Mar 2019, 01:31
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

84% (00:52) correct 16% (01:07) wrong based on 43 sessions

HideShow timer Statistics

Manager
Manager
avatar
S
Joined: 17 May 2018
Posts: 140
Location: India
Re: ABC above is an isosceles triangle in which AB = AC. What is the area  [#permalink]

Show Tags

New post 13 Mar 2019, 01:40
Using the formula:
{b(4a^2-b^2)^1/2}/4 = 12
B is the base or unequal side and a is the length of equal sides

Posted from my mobile device
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 18 Aug 2017
Posts: 5479
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: ABC above is an isosceles triangle in which AB = AC. What is the area  [#permalink]

Show Tags

New post 13 Mar 2019, 03:38
Bunuel wrote:
Image

△ABC above is an isosceles triangle in which AB = AC. What is the area of △ABC?

A. 30
B. 24
C. 20
D. 15
E. 12


Attachment:
trid22 (1).png

drop a perpendicular from A to BC D ; BD=DC= 3
so triangle ABD ; AD= 4 and area = 4*3*.5 = 6 and for complete triangel area = 12
IMO E
Senior Manager
Senior Manager
avatar
G
Joined: 25 Feb 2019
Posts: 335
Reviews Badge
Re: ABC above is an isosceles triangle in which AB = AC. What is the area  [#permalink]

Show Tags

New post 13 Mar 2019, 04:01
IMO E

perpendular from A will bisect the side BC

so we can find height by using pythagoras theoram.

√25 - 9 = √16 = 4

so area = 6*4/2 = 12

Posted from my mobile device
Target Test Prep Representative
User avatar
V
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8680
Location: United States (CA)
Re: ABC above is an isosceles triangle in which AB = AC. What is the area  [#permalink]

Show Tags

New post 18 Mar 2019, 07:51
Bunuel wrote:
Image

△ABC above is an isosceles triangle in which AB = AC. What is the area of △ABC?

A. 30
B. 24
C. 20
D. 15
E. 12


Attachment:
trid22 (1).png


Dropping a height from A to BC, we see that we have created two 3-4-5 right triangles, and so the height is 4.

Thus, the area is (4 x 6)/2 = 12.

Answer: E
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

GMAT Club Bot
Re: ABC above is an isosceles triangle in which AB = AC. What is the area   [#permalink] 18 Mar 2019, 07:51
Display posts from previous: Sort by

ABC above is an isosceles triangle in which AB = AC. What is the area

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





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