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

 It is currently 07 Jul 2015, 10:45

### 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
TAGS:
Current Student
Joined: 11 May 2008
Posts: 560
Followers: 7

Kudos [?]: 59 [0], given: 0

Is triangle ABC a right triangle? 1. Angle ABC = angle BCA [#permalink]  28 Aug 2008, 19:23
Is triangle ABC a right triangle?

1. Angle ABC = angle BCA
2. Angle ABC = angle CAB + 30 degrees
SVP
Joined: 07 Nov 2007
Posts: 1824
Location: New York
Followers: 29

Kudos [?]: 565 [0], given: 5

Re: triangles... [#permalink]  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: 208
Followers: 3

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

Re: triangles... [#permalink]  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
Similar topics Replies Last post
Similar
Topics:
1 In triangle ABC angle ABC is 90 degrees. What is the 13 11 Oct 2008, 06:02
3 In the diagram to the right, triangle ABC has a right angle 17 03 Jul 2008, 15:12
Are all angles of triangle ABC smaller than 90 degrees? 1. 1 26 May 2008, 02:43
In triangle ABC angle ABC is 90 degrees. What is the 9 11 May 2008, 23:27
1 Are all angles of triangle ABC smaller than 90 degrees? 1. 4 02 Mar 2008, 07:55
Display posts from previous: Sort by