[填空题]
A reservoir of water has a cross-sectii foy95i-qul0bobb.rk + 4do+onal area shown ix.6hhdovl6-yr- s.ued+ l3 a o3csm u+n the shaded region of the diagram below, where x and y values are in metres. The bottom of the reservoir (the curve shown) has an equat l oo3um .+vrs-d 3h 6u6ha.c+x-sldyeion in the form
$y=k(x-8)^{2}$
1. Find the area of the rectangle OMNP, The area of the rectangle OMNP is determined by A$_1$= m$^2$.
2. Determine the value of k is $\frac{a}{b}$;a= ,b= .
3. Find the cross-sectional area of the reservoir.
The number is m$^2$.
