What is the formula for the surface area of a triangular prism?
I have a maths test tomorrow and need to know the formula for the surface area of a triangular prism. i have searched on the net and cant find what i am looking for!!
i am in year 8 so try to be simple !! 
The are two equal triangles on a triangular prism. The formula for each is 1/2*b*h.
Multiply by two because there are two triangles. 2*1/2*b*h or b*h.
There are three rectangles on a triangular prism. There formula for each is b*h. Multiply by three because there are three rectangles. 3*b*h.
Triangular based prism
Base shape: Triangle: base ‘b’, height ‘h’, and sides S1, S2 and S3
Area of base: ½b×h
Perimeter of base: S1+ S2 + S3
Surface area = bh + (S1+ S2 + S3)H
References :
Surface area = bh + (S1+ S2 + S3)H
References :
http://www.teacherschoice.com.au/Maths_Library/Area%20and%20SA/area_9.htm
If you get a piece of paper and fold it into a triangular prism, you’ll see that the area of the rectangular faces is just the perimeter of the triangles on the end, times the length.
If the area of the triangles on the ends is considered part of the area, then you must add that in, too.
References :
The are two equal triangles on a triangular prism. The formula for each is 1/2*b*h.
Multiply by two because there are two triangles. 2*1/2*b*h or b*h.
There are three rectangles on a triangular prism. There formula for each is b*h. Multiply by three because there are three rectangles. 3*b*h.
References :