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# M23-18

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Math Expert
Joined: 02 Sep 2009
Posts: 44290

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16 Sep 2014, 01:19
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Difficulty:

55% (hard)

Question Stats:

49% (00:42) correct 51% (01:00) wrong based on 122 sessions

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Are all the angles of triangle $$ABC$$ smaller than 90 degrees?

(1) $$AB \lt BC \lt AC$$

(2) $$\angle ABC = 80$$ degrees
[Reveal] Spoiler: OA

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Math Expert
Joined: 02 Sep 2009
Posts: 44290

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16 Sep 2014, 01:19
Official Solution:

Statement (1) by itself is insufficient.

Statement (2) by itself is insufficient.

Statements (1) and (2) combined are sufficient. S1 and S2 gives that $$\angle ABC$$ is the largest angle. Thus, the other two angles are smaller than 80 degrees and the answer to the question is "yes".

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Joined: 06 Mar 2014
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Location: India
GMAT Date: 04-30-2015

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14 Sep 2015, 17:23
Bunuel wrote:
Official Solution:

Statement (1) by itself is insufficient.

Statement (2) by itself is insufficient.

Statements (1) and (2) combined are sufficient. S1 and S2 gives that $$\angle ABC$$ is the largest angle. Thus, the other two angles are smaller than 80 degrees and the answer to the question is "yes".

It would be really helpful if it is explained how many possible scenarios possible for which Statement 2 alone is insufficient.
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Joined: 17 Oct 2015
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02 Mar 2016, 18:08
I think this is a high-quality question and the explanation isn't clear enough, please elaborate. I did not get why abc is the largest degree..
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Joined: 02 Sep 2009
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03 Mar 2016, 07:34
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mestrec wrote:
I think this is a high-quality question and the explanation isn't clear enough, please elaborate. I did not get why abc is the largest degree..

Since AB<BC<AC, then AC is the largest side. The largest angle in a triangle is opposite the largest side.
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Joined: 03 Jun 2016
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08 Jul 2016, 11:19
Hi Bunnel ,
As per statement 2 angle ABC = 80 so it is clear that NOT ALL angles of triangle ABC is <90 as other to angles can be (0,100). Therefore statement 2 is sufficient . Am I right ?
Math Expert
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08 Jul 2016, 12:43
mahawarchirag wrote:
Hi Bunnel ,
As per statement 2 angle ABC = 80 so it is clear that NOT ALL angles of triangle ABC is <90 as other to angles can be (0,100). Therefore statement 2 is sufficient . Am I right ?

Since the answer is C and not B, then obviously you are not right:
{80, 80, 20} ALL the angles are less than 90 degrees
{80, 95, 5} NOT ALL the angles are less than 90 degrees
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Joined: 18 Jun 2015
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11 Sep 2016, 04:35
From option 1 ac is the largest side that implies angle ABC to be the largest angle which equals 80 hence any other angle will be less than 80 degrees.
Which implies all the angles of triangle ABCABC smaller than 90 degrees.

Awesome question
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Joined: 08 Jun 2015
Posts: 370
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GMAT 1: 640 Q48 V29

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10 Mar 2018, 07:33
+1 for option C.
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Re: M23-18   [#permalink] 10 Mar 2018, 07:33
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# M23-18

Moderators: chetan2u, Bunuel

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