In a circle with centre O, AD is a diameter and AC is a chord. Point B is on AC such that OB = 7 cm and ∠OBA = 60°, If ∠DOC = 60°, then what is the length of BC?

In a circle with centre O, AD is a diameter and AC is a chord. Point B

1.	In a circle with centre O, AD is a diameter and AC is a chord. Point B is on AC such that OB = 7 cm and ∠OBA = 60°, If ∠DOC = 60°, then what is the length of BC?
A.	7 cm
B.	\(3\sqrt 7\) cm
C.	3.5 cm
D.	\(5\sqrt 7\) cm
Answer» B. \(3\sqrt 7\) cm

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In a circle with centre O, AD is a diameter and AC is a chord. Point B is on AC such that OB = 7 cm and ∠OBA = 60°, If ∠DOC = 60°, then what is the length of BC?

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