It is currently 17 Nov 2017, 20:28

### 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 triangle ABC is an isosceles triangle

Author Message
TAGS:

### Hide Tags

Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4488

Kudos [?]: 8731 [1], given: 105

If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

05 Nov 2012, 12:37
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

71% (01:05) correct 29% (01:30) wrong based on 188 sessions

### HideShow timer Statistics

If triangle ABC is an isosceles triangle, what is ∠ABC?

(1) ∠CAB = 45 degrees
(2) ∠BCA = 90 degrees

For a detailed discussion of that most amazing geometric theorem, the Isosceles Triangle Theorem, as well as a video explanation of this particular question, see this this link:
http://magoosh.com/gmat/2012/isosceles- ... -the-gmat/
[Reveal] Spoiler: OA

_________________

Mike McGarry
Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Kudos [?]: 8731 [1], given: 105

 Magoosh Discount Codes Math Revolution Discount Codes EMPOWERgmat Discount Codes
VP
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1078

Kudos [?]: 660 [0], given: 70

Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Re: If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

05 Nov 2012, 15:12
hi Mike

I think this question is same as in the gmat prep 1
only value is changed to 90

Kudos [?]: 660 [0], given: 70

Senior Manager
Joined: 25 Mar 2013
Posts: 275

Kudos [?]: 35 [0], given: 101

Location: United States
Concentration: Entrepreneurship, Marketing
GPA: 3.5
Re: If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

25 Sep 2013, 00:31
sir,
pls any explain why statement A wrong and statement B is rght......
_________________

I welcome analysis on my posts and kudo +1 if helpful. It helps me to improve my craft.Thank you

Kudos [?]: 35 [0], given: 101

Math Expert
Joined: 02 Sep 2009
Posts: 42248

Kudos [?]: 132524 [0], given: 12324

Re: If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

25 Sep 2013, 01:06
Expert's post
1
This post was
BOOKMARKED
kanusha wrote:
sir,
pls any explain why statement A wrong and statement B is rght......

If triangle ABC is an isosceles triangle, what is ∠ABC?

(1) ∠CAB = 45 degrees. The sum of the remaining two angles is 180-45=135 degrees. Triangle ABC can be 45-45-90 right isosceles triangle OR 67.5-67.5-45 isosceles triangle. Angle B can be 45, 90, or 67.5 degrees. Not sufficient.

(2) ∠BCA = 90 degrees. This statement says that we have 45-45-90 isosceles right triangle, where C=90 degrees, therefore the remaining two angles must be 45 degrees each. Sufficient.

Hope it's clear.
_________________

Kudos [?]: 132524 [0], given: 12324

Non-Human User
Joined: 09 Sep 2013
Posts: 15708

Kudos [?]: 281 [0], given: 0

Re: If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

30 Mar 2015, 05:21
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 [?]: 281 [0], given: 0

Non-Human User
Joined: 09 Sep 2013
Posts: 15708

Kudos [?]: 281 [0], given: 0

Re: If triangle ABC is an isosceles triangle [#permalink]

### Show Tags

04 Oct 2016, 20:06
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 [?]: 281 [0], given: 0

Re: If triangle ABC is an isosceles triangle   [#permalink] 04 Oct 2016, 20:06
Display posts from previous: Sort by