Surface area of a triangular prism...

Hello everyone. I'm hoping someone can give me a little bit of help. Here's the deal, I helped a friend with her homework - calculating the surface area of triangular prisms - a couple of nights ago. It looks like I've done something wrong, however, because when she returned home she hadn't gotten a single correct answer. Anyway, here's what I've got, maybe someone can tell me if my answers are correct. This is the formula that I used: ab+ (s1+s1+s3)h

1: 144 square inches

6x8 + (10 + 6 + 8)4 = 144

2: 216 square feet

3: 48 square km

4: 60 square cm

5: 212 square yards

6: 84 square inches

http://img46.imageshack.us/img46/8247/prisms.jpg