$3\mathrm{.}5)$ The The $4-$m$-$diameter circular gate of the figure is located in the incline wall of a large reservoir containing water $)=(9\mathrm{.}80k\frac{N}{m^3}.$ The gate is mounted on a shaft along its horizontal diameter, and the water depth is $10m$ above the shaft. Determine the magnitude of the resultant force exerted on the gate by the water?

$($a$)1350KN$

$($b$)1230KN$

$($c$)1530KN$

$($d$)1450KN$