37. As shown in the figure, a line passing through the origin intersects the graph of the inverse proportion function $y=-\frac{6}{x}$ at points $A, C$. Perpendiculars are drawn from points $A$, $C$ to the $x$-axis, with feet of the perpendiculars at $B, D$, respectively. The area of quadrilateral $A B C D$ is $\qquad$.
answer: 12