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SUFFICIENT conditions for Special Right triangle

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SUFFICIENT conditions for Special Right triangle  [#permalink]

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New post 11 Aug 2017, 19:06
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If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?

(1) Angle ABD = 60°

(2) AC = 12

After getting this question wrong (above), I realized I still do not distinguish what conditions are SUFFICIENT for assuming that a triangle is a 30-60-90 triangle and what conditions show that the triangle COULD be a 30-60-90 but I cannot assume it based on the information given.

So what conditions are sufficient for me to assume a triangle is indeed a specific type of triangle?

Thank you!

--== Message from the GMAT Club Team ==--

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This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: SUFFICIENT conditions for Special Right triangle  [#permalink]

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New post 11 Aug 2017, 21:15
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giuliab3 wrote:
If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?

(1) Angle ABD = 60°

(2) AC = 12

After getting this question wrong (above), I realized I still do not distinguish what conditions are SUFFICIENT for assuming that a triangle is a 30-60-90 triangle and what conditions show that the triangle COULD be a 30-60-90 but I cannot assume it based on the information given.

So what conditions are sufficient for me to assume a triangle is indeed a specific type of triangle?

Thank you!


Does the question specify where B is located with respect to ADC?
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Location: Singapore
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GMAT 1: 660 Q46 V34
GPA: 3.83
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Re: SUFFICIENT conditions for Special Right triangle  [#permalink]

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New post 11 Aug 2017, 22:14
HanoiGMATtutor wrote:
giuliab3 wrote:
If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?

(1) Angle ABD = 60°

(2) AC = 12

After getting this question wrong (above), I realized I still do not distinguish what conditions are SUFFICIENT for assuming that a triangle is a 30-60-90 triangle and what conditions show that the triangle COULD be a 30-60-90 but I cannot assume it based on the information given.

So what conditions are sufficient for me to assume a triangle is indeed a specific type of triangle?

Thank you!


Does the question specify where B is located with respect to ADC?


It´s the problem discussed in this link: https://gmatclub.com/forum/if-ad-is-6-a ... 01200.html
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Re: SUFFICIENT conditions for Special Right triangle  [#permalink]

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New post 11 Aug 2017, 22:27
giuliab3 wrote:
HanoiGMATtutor wrote:
giuliab3 wrote:
If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?

(1) Angle ABD = 60°

(2) AC = 12

After getting this question wrong (above), I realized I still do not distinguish what conditions are SUFFICIENT for assuming that a triangle is a 30-60-90 triangle and what conditions show that the triangle COULD be a 30-60-90 but I cannot assume it based on the information given.

So what conditions are sufficient for me to assume a triangle is indeed a specific type of triangle?

Thank you!


Does the question specify where B is located with respect to ADC?


It´s the problem discussed in this link: https://gmatclub.com/forum/if-ad-is-6-a ... 01200.html


Got it. A triangle is defined when you know two angles and the side in between, two sides and the angle in between, or all 3 sides. Obviously, when you know two angles, you also know the third one, and in a right triangle, once you know two sides, you also know the third one. See you if these hints help you make sense of the problem. :wink:
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Re: SUFFICIENT conditions for Special Right triangle  [#permalink]

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New post 12 Aug 2017, 01:20
giuliab3 wrote:
If AD is 6, and ADC is a right angle, what is the area of triangular region ABC?

(1) Angle ABD = 60°

(2) AC = 12

After getting this question wrong (above), I realized I still do not distinguish what conditions are SUFFICIENT for assuming that a triangle is a 30-60-90 triangle and what conditions show that the triangle COULD be a 30-60-90 but I cannot assume it based on the information given.

So what conditions are sufficient for me to assume a triangle is indeed a specific type of triangle?

Thank you!


This question is discussed here: if-ad-is-6-and-adc-is-a-right-angle-what-is-the-area-of-101200.html Please continue discussion in that post.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.


If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: SUFFICIENT conditions for Special Right triangle   [#permalink] 12 Aug 2017, 01:20
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SUFFICIENT conditions for Special Right triangle

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