It is currently 23 Sep 2017, 06:10

### 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

# Is the triangle with three sides a, b, c, isosceles?

Author Message
TAGS:

### Hide Tags

Manager
Joined: 05 Mar 2010
Posts: 205

Kudos [?]: 37 [0], given: 8

Is the triangle with three sides a, b, c, isosceles? [#permalink]

### Show Tags

09 Jun 2010, 11:18
3
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

50% (00:26) correct 50% (00:23) wrong based on 155 sessions

### HideShow timer Statistics

Is the triangle with three sides a, b, c, isosceles?

(1) a = b
(2) c ≠ b

OA will be posted later
[Reveal] Spoiler: OA

_________________

Success is my Destiny

Last edited by Bunuel on 20 Jun 2013, 04:56, edited 1 time in total.

Kudos [?]: 37 [0], given: 8

Manager
Joined: 02 May 2010
Posts: 57

Kudos [?]: 43 [0], given: 3

Schools: IU, UT Dallas, Univ of Georgia, Univ of Arkansas, Miami University
WE 1: 5.5 Yrs IT

### Show Tags

09 Jun 2010, 11:28
IMO C

A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.

A and B together - SUFFICIENT.

Kudos [?]: 43 [0], given: 3

Math Expert
Joined: 02 Sep 2009
Posts: 41695

Kudos [?]: 124571 [0], given: 12079

### Show Tags

09 Jun 2010, 12:07
Expert's post
1
This post was
BOOKMARKED
hardnstrong wrote:
Is the triangle with three sides a,b,c, isosceles?
(1) a = b
(2) c ≠ b

OA will be posted later

sjayasa wrote:
IMO C

A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.

A and B together - SUFFICIENT.

This cannot be the real GMAT question as it test technicality of defining isosceles triangle:
If we say that an isosceles triangle is a triangle with exactly two equal sides then the answer is C.
If we say that an isosceles triangle is a triangle with at least two equal sides then answer is A. So if we take this definition (which is more precise and more common) then we'll have that equilateral triangle is just a special case of isosceles triangle.

If I had to pick I'd pick A for this question.
_________________

Kudos [?]: 124571 [0], given: 12079

Manager
Joined: 04 Apr 2010
Posts: 160

Kudos [?]: 213 [0], given: 31

### Show Tags

09 Jun 2010, 13:51
I thinks the answer should be A.
_________________

Consider me giving KUDOS, if you find my post helpful.
If at first you don't succeed, you're running about average. ~Anonymous

Kudos [?]: 213 [0], given: 31

Manager
Joined: 05 Mar 2010
Posts: 205

Kudos [?]: 37 [0], given: 8

### Show Tags

09 Jun 2010, 23:49
OA is A

i found this question in one of the good sources of questions in GMAT found on other website
Though the question is with diagram of a triangle with three sides given as a,b,c

stmt 1. Explanation there says that because a=b hence it is an isosceles triangle (what about c , we dont know if c is equal to a or b, or not)

It says stmt 2 is insufficient because c is not equal to b (if in statement1 we didnt consider c then why to consider a in statment 2)

Answer itself contradicts each other. Thats why i posted it here to get to know if i am missing something
_________________

Success is my Destiny

Kudos [?]: 37 [0], given: 8

Current Student
Joined: 06 Sep 2013
Posts: 1988

Kudos [?]: 708 [0], given: 355

Concentration: Finance

### Show Tags

13 Oct 2013, 15:41
Bunuel wrote:
hardnstrong wrote:
Is the triangle with three sides a,b,c, isosceles?
(1) a = b
(2) c ≠ b

OA will be posted later

sjayasa wrote:
IMO C

A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.

A and B together - SUFFICIENT.

This cannot be the real GMAT question as it test technicality of defining isosceles triangle:
If we say that an isosceles triangle is a triangle with exactly two equal sides then the answer is C.
If we say that an isosceles triangle is a triangle with at least two equal sides then answer is A. So if we take this definition (which is more precise and more common) then we'll have that equilateral triangle is just a special case of isosceles triangle.

If I had to pick I'd pick A for this question.

Hi Bunuel, thanks for pointing it out.
What does GMAT say about isosceles/equilateral definition? Is there a common agreement?

Kudos [?]: 708 [0], given: 355

Math Expert
Joined: 02 Sep 2009
Posts: 41695

Kudos [?]: 124571 [0], given: 12079

### Show Tags

13 Oct 2013, 15:48
jlgdr wrote:
Bunuel wrote:
hardnstrong wrote:
Is the triangle with three sides a,b,c, isosceles?
(1) a = b
(2) c ≠ b

OA will be posted later

sjayasa wrote:
IMO C

A alone is INSUFFICIENT. Given a=b, but we do not know anything about c. If c=a, then it is equilateral.
B alone is INSUFFICIENT. Given c≠b, we know nothing about 'a' here.

A and B together - SUFFICIENT.

This cannot be the real GMAT question as it test technicality of defining isosceles triangle:
If we say that an isosceles triangle is a triangle with exactly two equal sides then the answer is C.
If we say that an isosceles triangle is a triangle with at least two equal sides then answer is A. So if we take this definition (which is more precise and more common) then we'll have that equilateral triangle is just a special case of isosceles triangle.

If I had to pick I'd pick A for this question.

Hi Bunuel, thanks for pointing it out.
What does GMAT say about isosceles/equilateral definition? Is there a common agreement?

According to the OG an isosceles triangle has at least two sides of the same length.

As for equilateral triangle: equilateral triangle is a triangle which has all sides of the same length.
_________________

Kudos [?]: 124571 [0], given: 12079

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 17613

Kudos [?]: 271 [0], given: 0

Re: Is the triangle with three sides a, b, c, isosceles? [#permalink]

### Show Tags

17 Sep 2016, 12:16
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 271 [0], given: 0

Re: Is the triangle with three sides a, b, c, isosceles?   [#permalink] 17 Sep 2016, 12:16
Similar topics Replies Last post
Similar
Topics:
1 In isosceles triangle ABC, what is the value of ∠C? (1) The measure of 1 04 Jan 2017, 00:59
8 A triangle has side lengths of a, b, and c centimeters. Does each angl 2 19 Jul 2017, 15:56
5 a, b, and c are sides of a right triangle. What is the area of the tri 5 29 Jan 2016, 21:50
9 What is the area of triangle with sides a, b and hypotenuse c? 4 20 Sep 2016, 06:00
3 The sides of a triangle are a, b, and c. Are the three angles 3 24 Mar 2017, 10:49
Display posts from previous: Sort by