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If AD is 6 and ADC is a right angle, what is the area of

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Re: Area of triangular region [#permalink] New post 15 Dec 2013, 22:21
Expert's post
AccipiterQ wrote:

I thought if you dropped a line down from a triangle vertex and it formed a right angle on the opposite side then that line bisected the side? So in this case if you know what BD is then you know what DC is?



To figure out whether it holds, why don't you try drawing some extreme figures, say, something like this:
Attachment:
Ques3.jpg
Ques3.jpg [ 3.67 KiB | Viewed 364 times ]


Will this be true in this case?
When will it be true? When the triangle is equilateral, sure. Also when the triangle is isosceles if the equal sides form the angle from which the altitude is dropped.

Don't put your faith in the figure given. It may be just one of the many possibilities or may be somewhat misleading.
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Re: If AD is 6 and ADC is a right angle, what is the area of [#permalink] New post 15 Dec 2013, 22:50
amitjash wrote:
Attachment:
Triangle.jpg
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


Statement I is insufficient

The left triangle becomes a 90 30 60 triangle however we don't know anything about the right triangle

Statement II is insufficient

The right triangle becomes a 90 30 60 triangle however we don't know anything about the left triangle

Combining is sufficient
We know both the triangles are 90 30 60 with same sides.

Hence Answer is C

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Re: Area of triangular region [#permalink] New post 24 Jan 2014, 21:10
Hi Bunuel,

I have a question.

Can I not imagine that, in a right angled triangle if one of the side of a triangle bears x square root 3 as its length can I not imagine that it's a 30-60-90? If not why.

Please help.
Thanks
Suneel
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Re: Area of triangular region [#permalink] New post 25 Jan 2014, 02:39
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dasikasuneel wrote:
Hi Bunuel,

I have a question.

Can I not imagine that, in a right angled triangle if one of the side of a triangle bears x square root 3 as its length can I not imagine that it's a 30-60-90? If not why.

Please help.
Thanks
Suneel


What do you mean by "imagine"? How does the length of one side define the angles?
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Re: If AD is 6 and ADC is a right angle, what is the area of [#permalink] New post 06 Feb 2014, 10:28
Bunuel wrote:
manimgoindowndown wrote:
Hey I had the same question as the last poster. How do we know that BD and DC are of the same length? or that angle BAC has been bisected?


They are not equal: BD=\frac{6}{\sqrt{3}} (from the first statement) and AD=6*\sqrt{3} (from the second statement).



I think answer is E, since it is not given that BDC points are collinear.
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Re: If AD is 6 and ADC is a right angle, what is the area of [#permalink] New post 07 Feb 2014, 04:27
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virendrasd wrote:
Bunuel wrote:
manimgoindowndown wrote:
Hey I had the same question as the last poster. How do we know that BD and DC are of the same length? or that angle BAC has been bisected?


They are not equal: BD=\frac{6}{\sqrt{3}} (from the first statement) and AD=6*\sqrt{3} (from the second statement).



I think answer is E, since it is not given that BDC points are collinear.


That's not correct.

OG13, page 272:
A figure accompanying a data sufficiency problem will conform to the information given in the question but will not necessarily conform to the additional information given in statements (1) and (2).
Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight.
You may assume that the positions of points, angles, regions, and so forth exist in the order shown and that angle measures are greater than zero degrees.
All figures lie in a plane unless otherwise indicated.

OG13, page 150:
Figures: A figure accompanying a problem solving question is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Lines shown as straight are straight, and lines that appear jagged are also straight. The positions of points, angles, regions, etc., exist in the order shown, and angle measures are greater than zero. All figures lie in a plane unless otherwise indicated.

Hope it helps.
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Re: If AD is 6 and ADC is a right angle, what is the area of [#permalink] New post 18 Mar 2014, 00:11
what if question wud have been like this..

If AD is 6, and ADC is a right angle, what is the area of equilateral triangle ABC?
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Re: If AD is 6 and ADC is a right angle, what is the area of [#permalink] New post 18 Mar 2014, 07:51
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sanjoo wrote:
what if question wud have been like this..

If AD is 6, and ADC is a right angle, what is the area of equilateral triangle ABC?


Then statement 1 would have been irrelevant and statement 2 would have been incorrect. If side of an equilateral triangle is 12, the altitude would be (\sqrt{3}/2)*12 = 6*\sqrt{3}
But AD is given to be 6.
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Re: If AD is 6 and ADC is a right angle, what is the area of   [#permalink] 18 Mar 2014, 07:51
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