Answer:
622m²
Step-by-step explanation:
Alright so i'll do the area of the rectangular triangular prism first.
Because the formula for a rectangular triangular prism is SA=bh+pl we'll use that.
We have to find p first though, the formula for p is p=b+h+c
p=3+4+5
p=12
Now that we have p we can finish doing the problem.
3×4+12×19=240m²
We have the first shape down, now for the rectangle
2×(19×5 + 19×4 + 5×4) = 382 m²
So just add 382m² and 240m² and you get 622m²
