railway DFCCIL Executive 2025 Mock Test Quantitative Aptitude Geometry Circles, Chords and Tangents

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 cm)?

1
3.5
2
9
3
7
4
5
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