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ABC is a triangle with BC = AC = 6. D is a point on AB. What is the

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Bunuel
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ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   17 Jul 2017, 23:19
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ABC is a triangle with BC = AC = 6. D is a point on AB. What is the length of CD?

(1) ∠ACB = 120◦.
(2) CD is the bisector of ∠ACB.
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C
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jedit
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ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   Updated on: 19 Jul 2017, 00:46
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Bunuel wrote:
ABC is a triangle with BC = AC = 6. D is a point on AB. What is the length of CD?

(1) ∠ACB = 120◦.
(2) CD is the bisector of ∠ACB.


It should be C.

Statement 1: This provides us no information about D.

Statement 2: We need at least 3 parameters to accurately measure a triangle and with length of two arms, we have no way of measuring the original triangle ABC.

Combined, we should be able to measure the original triangle and its equal split at D.

Edit: Attaching diagram.
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diagram3.jpg
diagram3.jpg [ 17 KiB | Viewed 1808 times ]


Originally posted by jedit on 18 Jul 2017, 02:07.
Last edited by jedit on 19 Jul 2017, 00:46, edited 1 time in total.
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ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   Updated on: 18 Jul 2017, 09:39
Bunuel wrote:
ABC is a triangle with BC = AC = 6. D is a point on AB. What is the length of CD?

(1) ∠ACB = 120◦.
(2) CD is the bisector of ∠ACB.



the given triangle is isoscles traingle...

stat1 : no info on location of D

stat2: not suff to calculte the length of CD..

both combines,,, triangle BCD is 30-60-90 and hence CD= 3..
ans C

hope tat helps

Originally posted by mohshu on 18 Jul 2017, 08:30.
Last edited by mohshu on 18 Jul 2017, 09:39, edited 1 time in total.
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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   18 Jul 2017, 08:47
Value will not be 6 as per my calculation. Please correct me if I am wrong.
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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   18 Jul 2017, 09:40
vivek2k70 wrote:
Value will not be 6 as per my calculation. Please correct me if I am wrong.


corrected the ans,,hope it helps
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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   18 Jul 2017, 23:47
IMO Answer is A .
Taking approach of co-ordinate geometry, if we know angle ACB and assuming point C as origin we can find co-ordinates ofpoint A and point B . And so we also find the mid point of point A and point B. Once done we can calculate distance between two points D and C.

But option 2 will not help find anything necessary.

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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   19 Jul 2017, 00:45
gmat4varun wrote:
IMO Answer is A .
Taking approach of co-ordinate geometry, if we know angle ACB and assuming point C as origin we can find co-ordinates ofpoint A and point B . And so we also find the mid point of point A and point B. Once done we can calculate distance between two points D and C.

But option 2 will not help find anything necessary.

Sent from my SM-J500F using GMAT Club Forum mobile app


See the attached diagram. We have no idea of where point D lies and A gives us no clue about its position.
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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink] New post   19 Jul 2017, 01:29
Yes..my bad..i lose much of my marks by bad reading. Dont know hoe I read tgat point D is at the center of line. This has to stop otherwise I will not score much in GMAT.

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Re: ABC is a triangle with BC = AC = 6. D is a point on AB. What is the [#permalink]
19 Jul 2017, 01:29
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