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Ram Soren

· started a discussion

· 1 Months ago

explain (Question: 246448.0 )

OBA = 2y..... how..??

Question:
In the figure, AB is the chord of a circle with centre O. AB is extended to C such that BC = OB. The straight line CO is produced to meet the circle at D. If ∠ACD = y° and ∠AOD = x° such that x = ky, then the value of k is –



Options:
A) 3
B) 2
C) 1
D) None of these 
Solution:

Ans: (a)


Jagdish Yadav

· commented

· 1 Months ago

External Angle Property. Since OB=BC, angle BOC = angle BCO = y and angle OBA=2y.
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