value of x in region OAB

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gibran: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Sat Apr 12, 2008 8:51 am; Thanked: 1 times

by gibran » Sat May 17, 2008 7:22 am

In the figure attached, O is the center of the circle. If the area of the region OAB is 2PI, what is the value of x?
A. 45/2
B. 30
C. 45
D. 60
E. 90

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Source: Beat The GMAT — Problem Solving | Sat May 17, 2008 7:22 am

ksh: Master | Next Rank: 500 Posts; Posts: 106; Joined: Sun Feb 17, 2008 10:09 pm; Thanked: 3 times

by ksh » Sun May 18, 2008 2:06 am

hi gibran,

we can proceed as follows:

x/360=2pie/16pie

x=360/8=45

is the ans c?

ask me if u have confusion

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gibran: Senior | Next Rank: 100 Posts; Posts: 42; Joined: Sat Apr 12, 2008 8:51 am; Thanked: 1 times

by gibran » Mon May 19, 2008 5:46 am

Thanks .... I understood. The OA is C

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