Find the area of the segment \(AYB\) shown in the figure, if the radius of the circle is \(21 cm\) and \(\angle AOB = 120^\circ\). (Use \(\pi = \frac{22}{7}\)

Solution:
Area of the sector \(OAYB\) \(=\) \(cm^2\)
\(AB = \) \(AM\)
Area of the segment \(AYB\) \(=\) \(cm^2\)