Find the surface area
The surface area of the triangular prism is equal to
SA=2B+PL
where
B is the area of the triangular face
P is the perimeter of the triangular face
L is the length of the prism
so
B=(1/2)(0.9)(1.2)
B=0.54 m2
P=0.9+1.2+1.5
P=3.6 m
L=3.5 m
substitute
SA=2(0.54)+3.6(3.5)
SA=13.68 m2
so
B=(1/2)(0.9)(1.2)
B=
