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

 It is currently 19 Aug 2018, 08:27

### 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

# What is the area

Author Message
Intern
Joined: 31 Jan 2017
Posts: 48

### Show Tags

22 Sep 2017, 21:31
What is the area of the triangle ?

1) Two sides are 41cm each

2) The altitude to the third side of the triangle is 9 cm

Need a detailed solution plz

Sent from my HTC Desire 816G dual sim using GMAT Club Forum mobile app

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Senior Manager
Joined: 02 Jul 2017
Posts: 294
GMAT 1: 730 Q50 V38
Re: What is the area  [#permalink]

### Show Tags

23 Sep 2017, 01:26
What is the area of the triangle ?

Find attached figure for reference.
Let triangle be ABC.

1) Two sides are 41cm each
AB =AC=41
As we dont know about third side
Insufficient.

2) The altitude to the third side of the triangle is 9 cm
So if we draw perpendicular from vertex to base = altitude = 9
Only altitude give.
Insufficient

(1)+(2)
As AB=AC=41
As given altitude to "third" side =9. We can assume AD perpendicular to BC =9
[Here if statement said : The altitude to one side of the triangle is 9 cm, we will not be able to calculate area as we dont knw on which side perpendicular is drawn)

So by Pythagorean theorem in triangle ABD, we found BD =40.
So BC = BD*2 = 40

Area = 1/2*80*9 = 360
Sufficient

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

Attachments

IMG_0295.jpg [ 2.18 MiB | Viewed 343 times ]

Re: What is the area &nbs [#permalink] 23 Sep 2017, 01:26
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®.