Verified Answer :

Bannana21

Surface are just means that you need to find the area of every face, then add. 

TO find the Area of the rectangle do 168 = 128

For the triangle the area formula is bh1/2 So do 78*1/2= 28   

There are four sides total and two triangles and two rectangles so 28+28+128+128= 312

SO the surface area is 312 in cubed

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To find the Surface Area of a Triangular based prism you need to use the following formula:  SA= bXh÷2 X H (of the prism)

In the question you have shown, the height is 8in, the base is 7in, and the height of the prism is 16in

so SA= 7X8÷2X16
= 448in^2
Therefore the Surface Area is 448in^2. Hope that helped!!

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