$30\mathrm{.}0$ cm

$2\mathrm{.}4$ Consider a closed box shaped like a triangular prism inside a horizontal electric field of dimension E $=7\mathrm{.}80$ X $104$ N$/$C$.$ Calculate the electric flux through $($a$)$ the vertical rectangular surface, $($b$)$ the lateral surface, and $($c$)$ the entire surface of the box.

$10\mathrm{.}0$ cm

$60\mathrm{.}0\backslash$deg