whoohoo a bunch of rectangles and triangles!
Since the end triangles have side lengths of 6, 8, and 10 they are a pythagorean triple which implies that they are right triangles. As such each has an area of 6(8)/2=24 m^2
The base is a rectangle with lengths 8 and 17 so its area is 8(17)=136 m^2
The "back" side has lengths of 6 and 17 so its area is 6(17)=102 m^2
And the "top" face has lengths of 10 and 17 so its area is 10(17)=170 m^2
Add them all together and we get 2(24)+136+102+170=456 m^2