It is currently 24 Sep 2017, 00:09

### 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 June
Open Detailed Calendar

# If p is the perimeter of rectangle X, what is the value of

Author Message
TAGS:

### Hide Tags

Intern
Joined: 06 Aug 2011
Posts: 4

Kudos [?]: 5 [0], given: 35

Location: United States
GMAT 1: 640 Q45 V31
GMAT 2: 700 Q47 V38
GPA: 3.87
WE: Marketing (Consumer Products)
If p is the perimeter of rectangle X, what is the value of [#permalink]

### Show Tags

02 Nov 2011, 12:11
Hi Everyone!
Pls, help me to understand why an answer "A" doesn't work for the following problem

If p is the perimeter of rectangle X,
what is the value of p?
1. Each diagonal of X has a length of 5
2. The area of X is 12

Why doesn't 3-4-5 rule aplicable here?

Kudos [?]: 5 [0], given: 35

Intern
Joined: 01 May 2011
Posts: 10

Kudos [?]: 3 [0], given: 1

### Show Tags

02 Nov 2011, 14:22
Imagine a square with diagonals = 1 and some perimeter, than virtually make this square almost flat rectangle. Is perimeter seems the same? So knowing only diagonals you can't be sure about perimeter.

Kudos [?]: 3 [0], given: 1

Manager
Joined: 29 Oct 2011
Posts: 180

Kudos [?]: 152 [0], given: 19

Concentration: General Management, Technology
Schools: Sloan '16 (D)
GMAT 1: 760 Q49 V44
GPA: 3.76

### Show Tags

02 Nov 2011, 15:48
3-4-5 rules doesn't apply because you only have the 5. You can only use 3-4-5 rules on a right triangle with two known sides.

Kudos [?]: 152 [0], given: 19

Intern
Joined: 06 Aug 2011
Posts: 4

Kudos [?]: 5 [0], given: 35

Location: United States
GMAT 1: 640 Q45 V31
GMAT 2: 700 Q47 V38
GPA: 3.87
WE: Marketing (Consumer Products)

### Show Tags

03 Nov 2011, 00:49
Thanks a lot! That's very clear a logical now

Kudos [?]: 5 [0], given: 35

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7615

Kudos [?]: 16946 [0], given: 230

Location: Pune, India

### Show Tags

03 Nov 2011, 03:28
gnothobiot wrote:
Hi Everyone!
Pls, help me to understand why an answer "A" doesn't work for the following problem

If p is the perimeter of rectangle X,
what is the value of p?
1. Each diagonal of X has a length of 5
2. The area of X is 12

Why doesn't 3-4-5 rule aplicable here?

3-4-5 is not the only way in which you get a 5 in the hypotenuse. But it is the only way in which all sides are integers with 5 as the hypotenuse. (Pythagorean triplets give you all integer sides.)

There are many other ways of getting 5 e.g.
1, $$\sqrt{24}$$, 5
2, $$\sqrt{21}$$, 5
etc
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for \$199

Veritas Prep Reviews

Kudos [?]: 16946 [0], given: 230

Manager
Joined: 28 Jul 2011
Posts: 110

Kudos [?]: 10 [0], given: 7

### Show Tags

03 Nov 2011, 06:42
Thanks for the explanation.

Kudos [?]: 10 [0], given: 7

Re: Right triangle rule   [#permalink] 03 Nov 2011, 06:42
Display posts from previous: Sort by