Use a net to find the surface area of the prism.

145 m2

240 m2

114 m2

290 m2

Anyhow... look at the picture below

so... a triangular prism, is just 2 triangles and 3 rectangles stacked up to each other at the edges, that's all they mean by the "net" bit

so.. get the area of each triangle, and each rectangle, and sum them up, that's the area of the triangular prism

you pretty much have all values, notice, the triangles have a height of 3 and a base of 4