A contractor is required to prepare a soil surface so that it is planar and the normal direction to the surface is within $0\mathrm{.}5$ of vertical. If the elevations at points A and $B,$ relative to the elevation at point $C,$ are $-3\mathrm{.}3ft$ and $-4\mathrm{.}2ft,$ respectively, determine the angle between the soil surface's normal direction and the vertical, and if the surface is sufficiently level. Take $\frac{?}{?}=550ft.$

The angle between the soil surface's normal direction is places.$)$

The surface $($

$($Round the final answer to four decimal

sufficiently level.