Calculating R, radius of the circle.
b = 360-240
b = 120°
b is the angle that is subtended by the 9 units chord with the radius of the circle.
R, radius of the circle is;
Observing Cosine Rule.
9² = 2R²-2R²cos120
81 = 3R²
R² = 27
R = √(27)
R = 3√(3) units.
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