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# I've attached my picture; my notes are in blue. Hopefully it

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Manager
Joined: 09 Feb 2006
Posts: 129
Location: New York, NY
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Kudos [?]: 3 [0], given: 0

I've attached my picture; my notes are in blue. Hopefully it [#permalink]  15 Apr 2006, 14:25
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
I've attached my picture; my notes are in blue. Hopefully it makes sense.
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triangle.jpg [ 37.83 KiB | Viewed 477 times ]

Last edited by jcgoodchild on 15 Apr 2006, 14:27, edited 1 time in total.
Manager
Joined: 09 Feb 2006
Posts: 129
Location: New York, NY
Followers: 1

Kudos [?]: 3 [0], given: 0

Sorry, I meant the answer is A in my picture. We only need to know that length. I'll edit, and repost it.
Senior Manager
Joined: 11 Nov 2005
Posts: 332
Location: London
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Kudos [?]: 8 [0], given: 0

A.

Your explanation is quite right, but the answe should be A.

BD = BC = 6, (isoscale)

jcgoodchild wrote:
I've attached my picture; my notes are in blue. Hopefully it makes sense.
Manager
Joined: 08 Feb 2006
Posts: 128
Followers: 1

Kudos [?]: 6 [0], given: 0

how did you know that the left angle is x degree?

I understood the 180-2x and 180-4x.
VP
Joined: 21 Sep 2003
Posts: 1066
Location: USA
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Kudos [?]: 39 [0], given: 0

Another easy way out:

Angle BDC is an Exterior angle of the triangle BAD. And in any traingle exterior angle is equal to the sum of the interior opposite angles. Hence

2x = x + ABD
=> ABD = x
=> AD = BD = 6
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