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Re: Geometry problem [#permalink]
18 May 2008, 15:16
Answer is D
Here is the explanation :
Since AB = OC, which is the radius of the circle --> AB = BO, so we have 2 iscoceless traingles, ABO and BOC. Lets say angles BAO is y, ACO is x. From option 1: since angle COD is 60, x+y = 180-120= 60 And 2y+180-x = 180for triangle ABO 2y = x 3y = 60 y =20
From option 2 : x = 40 degrees
From triangle ABO, 2y +180-x = 180 2y = x so, y = 20