tkarthi4u wrote:
Given :
AB = OC BOA = ?
Stmt 1 :
COD = 60 BOC is an isoceles triangle
OBC = 0CB = 60
AB0 = 180 -60 = 120
ABO is an isoceles triangle.
BAO = 30 .Sufficient.
Stmt 2:
Similarly BCO = 40.
BOC is an isoceles triangle OBC = 40
ABO = 140.
BAO = 20.
Sufficient.
Ans D
I am sorry but I didn't understand why OBC = 0CB = 60 in the first statement. We don't know the angle BOC. Could pls explain that. Although I agree with the answer D
My expaination of the first statement takes more time:
Let's take OBC = 0CB=x and BAO=BOA=y
We have a system of two equations:
2x=180-(180-60-y)
x=180-(180-2y)
2x=60+y
x=2y
3y=60
y=20