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# DS - Cliffs

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Director
Joined: 09 Aug 2006
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06 Nov 2006, 07:28
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Can someone help me solve this problem
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Director
Joined: 09 Aug 2006
Posts: 525
Followers: 2

Kudos [?]: 62 [0], given: 0

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06 Nov 2006, 07:49
I think this was stupid ..
Sorry ..
SVP
Joined: 01 May 2006
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06 Nov 2006, 08:21
(A) it is

The black surface is obtained by removing the surface of triangle ABC from the half surface of the circle.

To conclude, we need so to know the surface of the triangle ABC.

From 1
As B is at the middle of the arc AC, we know the surface of the triangle ABC : 12*6/2.

SUFF.

From 2
All points on the circle create a right angle with a diameter of the circle such as AC. Thus, we cannot know the surface of the triangle ABC.

INSUFF.
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