It is currently 10 Dec 2017, 19:20

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0),

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

Hide Tags

Expert Post
Math Revolution GMAT Instructor
User avatar
P
Joined: 16 Aug 2015
Posts: 4451

Kudos [?]: 3125 [0], given: 0

GPA: 3.82
Premium Member
In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 19 Oct 2017, 00:05
Expert's post
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

67% (00:33) correct 33% (00:41) wrong based on 55 sessions

HideShow timer Statistics

[GMAT math practice question]

In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), and C(m,n). What is the area of the triangle ABC?

1) m=2
2) n=2
[Reveal] Spoiler: OA

_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
Find a 10% off coupon code for GMAT Club members.
“Receive 5 Math Questions & Solutions Daily”
Unlimited Access to over 120 free video lessons - try it yourself
See our Youtube demo

Kudos [?]: 3125 [0], given: 0

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42529

Kudos [?]: 135163 [0], given: 12664

Re: In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 19 Oct 2017, 02:13
MathRevolution wrote:
[GMAT math practice question]

In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), and C(m,n). What is the area of the triangle ABC?

1) m=2
2) n=2


This is a copy of the following question: https://gmatclub.com/forum/in-the-coord ... 49146.html
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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. ,11 Mixed Questions, 12 Fresh Meat

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., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135163 [0], given: 12664

Expert Post
Math Revolution GMAT Instructor
User avatar
P
Joined: 16 Aug 2015
Posts: 4451

Kudos [?]: 3125 [0], given: 0

GPA: 3.82
Premium Member
Re: In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 22 Oct 2017, 21:15
=>
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember that equal number of variables and independent equations ensures a solution.
The first step of VA(Variable Approach) method is modifying the original condition and the question, and rechecking the number of variables and the number of equations.
We can consider AB as the base and the y-coordinate n of the point C as another point of the triangle, and |n| is its height.
Thus, its area is (1/2)*2*|n| = |n|.

Hence, only condition 2) is sufficient.

Therefore, B is the answer.

Answer: B
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
Find a 10% off coupon code for GMAT Club members.
“Receive 5 Math Questions & Solutions Daily”
Unlimited Access to over 120 free video lessons - try it yourself
See our Youtube demo

Kudos [?]: 3125 [0], given: 0

Intern
Intern
avatar
B
Joined: 15 Aug 2016
Posts: 42

Kudos [?]: 1 [0], given: 71

In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 23 Oct 2017, 07:49
MathRevolution wrote:
=>
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember that equal number of variables and independent equations ensures a solution.
The first step of VA(Variable Approach) method is modifying the original condition and the question, and rechecking the number of variables and the number of equations.
We can consider AB as the base and the y-coordinate n of the point C as another point of the triangle, and |n| is its height.
Thus, its area is (1/2)*2*|n| = |n|.

Hence, only condition 2) is sufficient.

Therefore, B is the answer.

Answer: B



Hi,
Can you explain why are you taking the triangle as right angled triangle?
It could be acute or obtuse also for example coordinates 3,2 will give obtuse triangle and in the question it is not mentioned that it is a right angled triangle.
Thats why I had marked C. Didnt understand why we should take it as right angled triangle.

Kudos [?]: 1 [0], given: 71

Expert Post
1 KUDOS received
Math Revolution GMAT Instructor
User avatar
P
Joined: 16 Aug 2015
Posts: 4451

Kudos [?]: 3125 [1], given: 0

GPA: 3.82
Premium Member
Re: In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 01 Nov 2017, 22:29
1
This post received
KUDOS
Expert's post
Utkarsh KOhli wrote:
MathRevolution wrote:
=>
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember that equal number of variables and independent equations ensures a solution.
The first step of VA(Variable Approach) method is modifying the original condition and the question, and rechecking the number of variables and the number of equations.
We can consider AB as the base and the y-coordinate n of the point C as another point of the triangle, and |n| is its height.
Thus, its area is (1/2)*2*|n| = |n|.

Hence, only condition 2) is sufficient.

Therefore, B is the answer.

Answer: B



Hi,
Can you explain why are you taking the triangle as right angled triangle?
It could be acute or obtuse also for example coordinates 3,2 will give obtuse triangle and in the question it is not mentioned that it is a right angled triangle.
Thats why I had marked C. Didnt understand why we should take it as right angled triangle.


Since A(-1,0), B(1,0) and AB is parallel to the x-axies, when we know y-coordinate of the point C, we identify the height of the triangle with the base AB.
We don't need to consider a right triangle in this case.
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
Find a 10% off coupon code for GMAT Club members.
“Receive 5 Math Questions & Solutions Daily”
Unlimited Access to over 120 free video lessons - try it yourself
See our Youtube demo

Kudos [?]: 3125 [1], given: 0

Intern
Intern
avatar
B
Joined: 08 Apr 2017
Posts: 28

Kudos [?]: 6 [0], given: 0

Re: In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0), [#permalink]

Show Tags

New post 01 Nov 2017, 23:35
We know AB. So let AB be the base of the triangle.
Now we need to find the height of the triangle... Y = K is a line parallel to x-axis.
The distance between this line and the x axis will always be the same as its parallel. Hence irrespective of the x axis or the point, the height of the triangle formed with any point in this line will be have the same area.
Option B gives us the solution Y = 3


Sent from my iPhone using GMAT Club Forum

Kudos [?]: 6 [0], given: 0

Re: In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0),   [#permalink] 01 Nov 2017, 23:35
Display posts from previous: Sort by

In the coordinate plane, a triangle ABC has 3 points A(-1,0), B(1,0),

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


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.