Is triangle ABC a right triangle? 1. Angle ABC = angle BCA : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 11:16

### 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 triangle ABC a right triangle? 1. Angle ABC = angle BCA

Author Message
Current Student
Joined: 11 May 2008
Posts: 556
Followers: 8

Kudos [?]: 174 [0], given: 0

Is triangle ABC a right triangle? 1. Angle ABC = angle BCA [#permalink]

### Show Tags

28 Aug 2008, 19:23
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is triangle ABC a right triangle?

1. Angle ABC = angle BCA
2. Angle ABC = angle CAB + 30 degrees
SVP
Joined: 07 Nov 2007
Posts: 1820
Location: New York
Followers: 34

Kudos [?]: 862 [0], given: 5

### Show Tags

28 Aug 2008, 19:45
arjtryarjtry wrote:
Is triangle ABC a right triangle?

1. Angle ABC = angle BCA
2. Angle ABC = angle CAB + 30 degrees

say x,y,z are angles.
1) Angle ABC = angle BCA
x=y
insufficient.
2) Angle ABC = angle CAB + 30 degrees[/
x= z+30

insuffcient

combine
x+y+z=180
3x=210
x=70 y=70 z=40

suffcient

C.
_________________

Smiling wins more friends than frowning

Manager
Joined: 15 Jul 2008
Posts: 207
Followers: 3

Kudos [?]: 57 [0], given: 0

### Show Tags

28 Aug 2008, 19:45
arjtryarjtry wrote:
Is triangle ABC a right triangle?

1. Angle ABC = angle BCA
2. Angle ABC = angle CAB + 30 degrees

C.

st leaves too many possibilities. 60,60,60 50,50,80 30,30,120.....

st 2 also leaves too many possibilities 80,50,50 70,70,40.......

combine . let abc = bca =x. and let cab=y
from 2) y=x-30.

x+x+x-30 =180
solving x=70, y=40. so not a right triaanlg
Re: triangles...   [#permalink] 28 Aug 2008, 19:45
Display posts from previous: Sort by