2A rectangular prism has six faces why might you have to find the surface for only 3 of hose faces: because the other 3 are the same so u just have to times the other ones by two.
4you times all sides by each other then you add the results
6 to find the area of this triangle 9.1x4.5/2=20.475x2=40.95
If you add all the answers together you will get the surface are of your triangle
8 for a you just count all the faces and for b you 180x60=10800cm=108m/2x2=108
then you add all of the answers together and you get your answer
Where is Mr.Harbeck