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

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

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15 Apr 2006, 15:25
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I've attached my picture; my notes are in blue. Hopefully it makes sense.
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Last edited by jcgoodchild on 15 Apr 2006, 15:27, edited 1 time in total.
Manager
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15 Apr 2006, 15:27
Sorry, I meant the answer is A in my picture. We only need to know that length. I'll edit, and repost it.
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15 Apr 2006, 15:38
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.
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15 Apr 2006, 16:23
how did you know that the left angle is x degree?

I understood the 180-2x and 180-4x.
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15 Apr 2006, 16:32
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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15 Apr 2006, 16:32
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