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M23-18

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M23-18 [#permalink]

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New post 16 Sep 2014, 01:19
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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
Spoiler: OA

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Re M23-18 [#permalink]

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New post 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".


Answer: C
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Re: M23-18 [#permalink]

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New post 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".


Answer: C



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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Re M23-18 [#permalink]

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New post 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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Re: M23-18 [#permalink]

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New post 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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Re: M23-18 [#permalink]

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New post 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 ?
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Re: M23-18 [#permalink]

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New post 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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Re: M23-18 [#permalink]

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New post 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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Re: M23-18 [#permalink]

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New post 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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