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In a circle with centre O, AD is a diame...

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

A

7 cm

B

`3sqrt(7)` cm

C

`3.5` cm

D

`5sqrt(7)` cm

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The correct Answer is:
A
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