Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 08 Feb 2016, 00:24

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

Area: Do you see a correct answer choice here?

Author Message
TAGS:
Current Student
Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
Followers: 17

Kudos [?]: 233 [0], given: 75

Area: Do you see a correct answer choice here? [#permalink]  03 Feb 2011, 07:43
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the area of a square that has a diagonal of length 10?

A. 5
B. 10
C. 20
D. 40
E. 45

Source: Cliff's GMAT
[Reveal] Spoiler: OA

_________________

My GMAT debrief: from-620-to-710-my-gmat-journey-114437.html

 Kaplan Promo Code Knewton GMAT Discount Codes Veritas Prep GMAT Discount Codes
Math Expert
Joined: 02 Sep 2009
Posts: 31286
Followers: 5345

Kudos [?]: 62138 [0], given: 9444

Re: Area: Do you see a correct answer choice here? [#permalink]  03 Feb 2011, 07:54
Expert's post
gmatpapa wrote:
What is the area of a square that has a diagonal of length 10?

A. 5
B. 10
C. 20
D. 40
E. 45

Source: Cliff's GMAT

$$area_{square}=side^2=\frac{diagonal^2}{2}$$: so A to be the answer either option A should read 50 instead of 5 or diagonal should be $$\sqrt{10}$$ instead of 10.
_________________
Current Student
Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
Followers: 17

Kudos [?]: 233 [0], given: 75

Re: Area: Do you see a correct answer choice here? [#permalink]  03 Feb 2011, 08:02
Bunuel wrote:
gmatpapa wrote:
What is the area of a square that has a diagonal of length 10?

A. 5
B. 10
C. 20
D. 40
E. 45

Source: Cliff's GMAT

$$area_{square}=side^2=\frac{diagonal^2}{2}$$: so A to be the answer either option A should read 50 instead of 5 or diagonal should be $$\sqrt{10}$$ instead of 10.

Yes. Answer quite clearly should be 50.

Does this OE make sense to you:
From the relationship that exists in a right triangle, we see that the sides of the square
must equal the square root of 5. Thus the area of the square is 5

_________________

My GMAT debrief: from-620-to-710-my-gmat-journey-114437.html

Math Expert
Joined: 02 Sep 2009
Posts: 31286
Followers: 5345

Kudos [?]: 62138 [0], given: 9444

Re: Area: Do you see a correct answer choice here? [#permalink]  03 Feb 2011, 08:07
Expert's post
gmatpapa wrote:
Bunuel wrote:
gmatpapa wrote:
What is the area of a square that has a diagonal of length 10?

A. 5
B. 10
C. 20
D. 40
E. 45

Source: Cliff's GMAT

$$area_{square}=side^2=\frac{diagonal^2}{2}$$: so A to be the answer either option A should read 50 instead of 5 or diagonal should be $$\sqrt{10}$$ instead of 10.

Yes. Answer quite clearly should be 50.

Does this OE make sense to you:
From the relationship that exists in a right triangle, we see that the sides of the square
must equal the square root of 5. Thus the area of the square is 5

As OE says that $$side=\sqrt{5}$$ then there must be the second case I suggested: diagonal should be $$\sqrt{10}$$ instead of 10.
_________________
Current Student
Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
Followers: 17

Kudos [?]: 233 [0], given: 75

Re: Area: Do you see a correct answer choice here? [#permalink]  03 Feb 2011, 08:15
Yep. Quite correct as diagonal = $$sqrt2$$*side. So side will be $$\frac{sqrt10}{sqrt2}$$= $$sqrt 5$$. And area will be $$side^2= 5$$.
_________________

My GMAT debrief: from-620-to-710-my-gmat-journey-114437.html

Senior Manager
Joined: 08 Nov 2010
Posts: 417
Followers: 7

Kudos [?]: 74 [0], given: 161

Re: Area: Do you see a correct answer choice here? [#permalink]  05 Feb 2011, 04:03
i did a bit different - x^2+x^2 = 10^2
x=squrt2*5
x^2 = 2*25 = 50
_________________
Current Student
Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
Followers: 17

Kudos [?]: 233 [0], given: 75

Re: Area: Do you see a correct answer choice here? [#permalink]  05 Feb 2011, 05:01
144144 wrote:
i did a bit different - x^2+x^2 = 10^2
x=squrt2*5
x^2 = 2*25 = 50

Its essentially the same thing if you look at it. Diagonal= $$sqrt2$$*side is arrived using the same formula that you have used. (Pythagoras theorem)
_________________

My GMAT debrief: from-620-to-710-my-gmat-journey-114437.html

Senior Manager
Joined: 08 Nov 2010
Posts: 417
Followers: 7

Kudos [?]: 74 [0], given: 161

Re: Area: Do you see a correct answer choice here? [#permalink]  05 Feb 2011, 09:23
ye, i noticed it after i posted. thanks.
_________________
Re: Area: Do you see a correct answer choice here?   [#permalink] 05 Feb 2011, 09:23
Similar topics Replies Last post
Similar
Topics:
16 Which of the answer choices properly lists the following in 6 11 Sep 2013, 16:59
1 doubtful question. can anyone explain the answer choice..? 2 27 Aug 2011, 14:01
6 n questions can either be true or false. If you answer all n correct 3 22 Mar 2011, 23:44
Test Answers Correct 3 11 Mar 2011, 10:31
Var in answer choice 1 10 Aug 2010, 14:40
Display posts from previous: Sort by