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In the past is about Surface area lxw in handing writing for the rectangularprism. For the Triangular prismlxw for the rectangles and bxh/2 for the triangles.

Let me show you how we did it.

if I did a rectangular prism so like, but first we do the formula.

l x w=A

#xside a=#

#xside a=#

then lxw= #

#x2=

#x2=

#x2= add them all up and you get the surface area Triangle l x w= b x h/2

By the time you got the answer add them up. Then you add the triangles and get the TSA ( TOTAL SURFACE AREA)