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#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # In triangle ABC,AB = AC= 2. Which of the following could be  Question banks Downloads My Bookmarks Reviews Important topics
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Founder  Joined: 18 Apr 2015
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In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
Expert's post 00:00

Question Stats: 38% (01:08) correct 61% (01:38) wrong based on 68 sessions

In triangle ABC,AB = AC= 2. Which of the following could be the area of the triangle ABC ?

Indicate all possible areas

❑ 0.5

❑ 1.0

❑ 1.5

❑ 2.0

❑ 2.5

❑ 3.0
[Reveal] Spoiler: OA

_________________ Director Joined: 03 Sep 2017
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
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This kind of question has to be answered using the range of areas a triangle can have given two sides.

The smallest triangle is the one with area slightly higher than 0 when the third side is so small that the triangle is shrank towards its base.

The largest triangle is the right triangle with legs equal to the two given sides, in this case 2 and 2.

Thus, the area range is $$0<Area\leq \frac{2*2}{2}$$ or $$0<area\leq 2$$.

The answers are A, B, C, D!
Intern Joined: 06 Nov 2017
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
IlCreatore wrote:
This kind of question has to be answered using the range of areas a triangle can have given two sides.

The smallest triangle is the one with area slightly higher than 0 when the third side is so small that the triangle is shrank towards its base.

The largest triangle is the right triangle with legs equal to the two given sides, in this case 2 and 2.

Thus, the area range is $$0<Area\leq \frac{2*2}{2}$$ or $$0<area\leq 2$$.

The answers are A, B, C, D!

Does the right triangle has the greatest area?? Can't the included angle be obtuse which would result in a larger area?
Founder  Joined: 18 Apr 2015
Posts: 6647
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Kudos [?]: 1275 , given: 6017

Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
Expert's post
Here, your assumption about the angle is wrong.

We do know from the stem that the triangle is a right triangle, with two equal sides 2 and 2, which means that we do also have two angles of 45° and the other of 90° that is on the opposite of the longest side: the hypotenus

From the properties of triangles, we do know that the third side must be between the sum of the two sides: 2+2=4, the longest side must be 3.9,3.8 and so on, AND the difference of the same two side: 2-2=0, which means that the third side must be 0.1,0.2, 0.3 and so forth.

Therefore, the area of the triangle must be between 0 and 2.

Hope this helps.

REGARDS
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Manager Joined: 15 Feb 2018
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
I am so incapable of understanding this question and also the solutions above. It is not necessarily a 45-45-90 triangle so isn't there many possibilities?

Would it be possible to give me a detailed explanation of the solution in the problem? I have this "it cannot be determined" answer in mind but obviously I am wrong.

The height or the base of the triangle can be anything, no? Would have been easier to explain what I am thinking with pictures but I guess they're not allowed. Founder  Joined: 18 Apr 2015
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
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Expert's post
Quote:
From the properties of triangles, we do know that the third side must be between the sum of the two sides: 2+2=4, the longest side must be 3.9,3.8 and so on, AND the difference of the same two side: 2-2=0, which means that the third side must be 0.1,0.2, 0.3 and so forth.

Therefore, the area of the triangle must be between 0 and 2.

More simple than this is very difficult to figure it out how to explain _________________ Manager  Joined: 26 Jun 2017
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
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Carcass wrote:
Here, your assumption about the angle is wrong.

We do know from the stem that the triangle is a right triangle, with two equal sides 2 and 2, which means that we do also have two angles of 45° and the other of 90° that is on the opposite of the longest side: the hypotenus

From the properties of triangles, we do know that the third side must be between the sum of the two sides: 2+2=4, the longest side must be 3.9,3.8 and so on, AND the difference of the same two side: 2-2=0, which means that the third side must be 0.1,0.2, 0.3 and so forth.

Therefore, the area of the triangle must be between 0 and 2.

Hope this helps.

REGARDS

But, on what basis can you regard this triangle as a right triangle, you can surely say it as isosceles, and only after drawing a perpendicular to the base, you can say that this is a right triangle.
_________________

What you think, you become. Manager Joined: 26 Jan 2018
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
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From question it is an isosceles triangle.

For area to be highest, it has to be a right angled triangle.

1/2 * base *height

1/2 * 2 * 2 = 2 is highest possible area. Any option less than this can be answer option.

Hence all the 4 option.

Please correct if my answer is wrong.
Intern Joined: 27 Nov 2014
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
Basic, the more uniform the shape is the higher the area will be. For a triangle with two equal sides the right triangle with 45: 45: 90 got the highest area.
Intern Joined: 13 Oct 2018
Posts: 21
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Re: In triangle ABC,AB = AC= 2. Which of the following could be [#permalink]
Carcass wrote:
Here, your assumption about the angle is wrong.

We do know from the stem that the triangle is a right triangle, with two equal sides 2 and 2, which means that we do also have two angles of 45° and the other of 90° that is on the opposite of the longest side: the hypotenus

From the properties of triangles, we do know that the third side must be between the sum of the two sides: 2+2=4, the longest side must be 3.9,3.8 and so on, AND the difference of the same two side: 2-2=0, which means that the third side must be 0.1,0.2, 0.3 and so forth.

Therefore, the area of the triangle must be between 0 and 2.

Hope this helps.

REGARDS

we know that the third side will be |2-2|<x<|2+2| i.e lie between 0-4. So my doubt arises that the area will be between 0 to 2.As the area is between 0-2 will the option D be the part of the answer ? I feel the areas will only be 0.5 1 and 1.5 the area can be 1.999 too but not 2 is what I feel. Please correct me if I'm wrong I have my gre in 4 days Re: In triangle ABC,AB = AC= 2. Which of the following could be   [#permalink] 28 Oct 2018, 11:47
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