triangle circle question

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canuckclint: Master | Next Rank: 500 Posts; Posts: 154; Joined: Tue Aug 26, 2008 12:59 pm; Location: Canada; Thanked: 4 times

by canuckclint » Fri Oct 31, 2008 3:36 pm

For the triangle shown above, where A, B and C are all points on a circle, and line segment AB has length 18, what is the area of triangle ABC?

(1) Angle ABC measures 30°.

(2) The circumference of the circle is 18.

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Source: Beat The GMAT — Problem Solving | Fri Oct 31, 2008 3:36 pm

canuckclint: Master | Next Rank: 500 Posts; Posts: 154; Joined: Tue Aug 26, 2008 12:59 pm; Location: Canada; Thanked: 4 times

by canuckclint » Fri Oct 31, 2008 3:37 pm

Also can you tell me if the second part was changed. Would this still work?
(2) The circumference of the circle is (some other number than 18)

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