Official solution
Area of Ellipse = \[\pi \]ab = 6\[\pi \]
\[ \therefore \] Required area = Area of ellipse
-- 4 (Area of triangle OAB)
= 6\[\pi \] - \[4\left( {{1 \over 2} \times 2 \times 3} \right)\]
= 6\[\pi \] - 12
= \[6\left( {\pi - 2} \right)\] sq.units