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If p is the perimeter of rectangle Q, what is the value of p

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If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 16 Jul 2012, 04:56
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The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

If p is the perimeter of rectangle Q, what is the value of p?

(1) Each diagonal of rectangle Q has length 10.
(2) The area of rectangle Q is 48.

Diagnostic Test
Question: 48
Page: 26
Difficulty: 650


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Re: If p is the perimeter of rectangle 0, what is the value of p [#permalink] New post 16 Jul 2012, 11:00
Let x and y be two sides of the rectangle.. then p =x+y

Stat1
Diagonal = 10
=> x^2 + y^2 = 10^2
we cannot find p i.e. x+y using this info so NOT SUFFICIENT

Sta2
Area = 48
=> xy =48
we cannot find p i.e. x+y using this info so NOT SUFFICIENT


Combining (1) and (2)
we will get
value of x+y = sqrt (x+y)^2 = sqrt(x^2 + y^2 + 2xy) = sqrt ( 10^2 + 2*48)
sqrt(196) = 14

SUFFICIENT
So, answer will be C
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Re: If p is the perimeter of rectangle 0, what is the value of p [#permalink] New post 20 Jul 2012, 04:40
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SOLUTION

If p is the perimeter of rectangle Q, what is the value of p?

Question: P=2(a+b)=?

(1) Each diagonal of rectangle Q has length 10. d^2=a^2+b^2=100. Not sufficient.
(2) The area of rectangle Q is 48. ab=48. Not sufficient.

(1)+(2) Square P --> P^2=4(a^2+b^2+2ab). Now as from (1) a^2+b^2=100 and from (2) ab=48, then P^2=4(a^2+b^2+2ab)=4(100+2*48)=4*196 --> P=\sqrt{4*196}=2*14=28. Sufficient.

Answer: C.

Similar questions to practice:
if-the-diagonal-of-rectangle-z-is-d-and-the-perimeter-of-104205.html
what-is-the-area-of-rectangular-region-r-105414.html
what-is-the-perimeter-of-rectangle-r-96381.html

Hope it helps.
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Re: If p is the perimeter of rectangle 0, what is the value of p [#permalink] New post 28 Jul 2012, 15:42
If instead, Q were a square, would 1 be sufficient?

In a rectangle, why can't we use the Isosceles Triangle to figure out the third side since the diagonals bisect each other?
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Re: If p is the perimeter of rectangle 0, what is the value of p [#permalink] New post 29 Jul 2012, 01:36
ctiger100 wrote:
If instead, Q were a square, would 1 be sufficient?

In a rectangle, why can't we use the Isosceles Triangle to figure out the third side since the diagonals bisect each other?


If we were told that Q is a square instead of a rectangle, then the answer would be D.

As for the second question: can you please explain what you mean? Generally you cannot find the sides of a rectangle just knowing the length of its diagonal, since knowing the length of hypotenuse (diagonal) in a right triangle (created by length and width), is not enough to find the legs of it (length and width).

Hope it's clear.
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Re: If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 12 Dec 2012, 14:40
I'm sorry I'm still not seeing how this is not answer "A". I understand the logic at arriving at answer "C", I just don't understand why you NEED to combine statements "1" and "2", contradicts my entire understanding of Data Sufficiency logic.

A rectangle is comprised of 4 right angles, no?

So ultimately the "diagonal" represents the hypotenuse forming two right triangles, no?

Can you form a right triangle with a hypotenuse of 10 with any other legs besides 6 and 8? Or do I have that wrong?

(pythagorean triplet (3, 4, 5) , (6, 8, 10))
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Re: If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 13 Dec 2012, 03:21
kelleygrad05 wrote:
I'm sorry I'm still not seeing how this is not answer "A". I understand the logic at arriving at answer "C", I just don't understand why you NEED to combine statements "1" and "2", contradicts my entire understanding of Data Sufficiency logic.

A rectangle is comprised of 4 right angles, no?

So ultimately the "diagonal" represents the hypotenuse forming two right triangles, no?

Can you form a right triangle with a hypotenuse of 10 with any other legs besides 6 and 8? Or do I have that wrong?

(pythagorean triplet (3, 4, 5) , (6, 8, 10))



Hi Kellygrad05,

There was a similar problem I was attempting yesterday on the forum.

Basically we are told that it is a rectangle but we aren't sure if the sides are Integers or not. For ex.

Diagonal-10, sides can be 6 and 8 (because of PT) or something like Square root 99 and 1...and such other combination

When you consider the st2 with above then we can figure out sides will be 6 and 8 as only in that condition Area will be 48 and Diagonal as 10.

Thanks
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Re: If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 13 Dec 2012, 04:18
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kelleygrad05 wrote:
I'm sorry I'm still not seeing how this is not answer "A". I understand the logic at arriving at answer "C", I just don't understand why you NEED to combine statements "1" and "2", contradicts my entire understanding of Data Sufficiency logic.

A rectangle is comprised of 4 right angles, no?

So ultimately the "diagonal" represents the hypotenuse forming two right triangles, no?

Can you form a right triangle with a hypotenuse of 10 with any other legs besides 6 and 8? Or do I have that wrong?

(pythagorean triplet (3, 4, 5) , (6, 8, 10))


A right triangle with hypotenuse 10, doesn't mean that we have (6, 8, 10) right triangle. If we are told that the lengths of all sides are integers, then yes: the only integer solution for right triangle with hypotenuse 10 would be (6, 8, 10).

To check this: consider the right triangle with hypotenuse 10 inscribed in circle. We know that a right triangle inscribed in a circle must have its hypotenuse as the diameter of the circle. The reverse is also true: if the diameter of the circle is also the triangle’s side, then that triangle is a right triangle.

So ANY point on circumference of a circle with diameter of 10 would make the right triangle with diameter. Not necessarily sides to be 6 and 8. For example we can have isosceles right triangle, which would be 45-45-90: and the sides would be \frac{10}{\sqrt{2}}. OR if we have 30-60-90 triangle and hypotenuse is 10, sides would be 5 and 5*\sqrt{3}. Of course there could be many other combinations.

Similar questions to practice:
if-the-diagonal-of-rectangle-z-is-d-and-the-perimeter-of-104205.html
what-is-the-area-of-rectangular-region-r-105414.html
what-is-the-perimeter-of-rectangle-r-96381.html

Hope it helps.
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Re: If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 13 Dec 2012, 08:37
Thank you Bunuel, it's clear my understanding of pythagorean triplets was incomplete. The example of the triangle within the circle was quite illuminating. So to summarize, if it is given that all sides of the triangle are integers, and the hypotenuse was given, only then I could have deduced it was part of a pythagorean triple, correct? Was that my only misstep at arriving at answer "A"?
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Re: If p is the perimeter of rectangle Q, what is the value of p [#permalink] New post 13 Dec 2012, 08:43
kelleygrad05 wrote:
Thank you Bunuel, it's clear my understanding of pythagorean triplets was incomplete. The example of the triangle within the circle was quite illuminating. So to summarize, if it is given that all sides of the triangle are integers, and the hypotenuse was given, only then I could have deduced it was part of a pythagorean triple, correct? Was that my only misstep at arriving at answer "A"?


Yes, that's correct.

For more check Triangles chapter of out Math Book: math-triangles-87197.html

DS geometry questions: search.php?search_id=tag&tag_id=32
PS geometry questions: search.php?search_id=tag&tag_id=53

Hope it helps.
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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!! ,11 Mixed Questions NEW!!!, 12 Fresh Meat NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!, 11 New DS set. NEW!!!


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Re: If p is the perimeter of rectangle Q, what is the value of p   [#permalink] 13 Dec 2012, 08:43
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