$(5)$

Three forces act on the trapezoidal plate shown. Find their

resultant $B($the single force that is equivalent to this $3-$force

system$).$ Specifically, find:

$($a$)$ the magnitude and direction of I $($expressed in mag$($direc form$)$

$($b$)$ the points where the LOA of $R$ interjects sides $AD$ and $CD$

of the plate

$($c$)$ plet these two points on a reasonably accuvate diagram of

the plate; then draw the LOA itself