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So when you find the surface area of a prism like this, you want to add up the areas of each of the individual surfaces.
Contained in the prism are 3 identical rectangles with dimensions of 5 x 20 and two triangles that have a base of 5 and a height of 4.3.
Area of rectangle : 5 * 20 = 100
Area of 3 rectangles : 3*100 = 300
Area of triangle : 1/2 * 5 * 4.3 = 10.75
Area of 2 triangle : 2*10.75 = 21.5
Surface area : 300 + 21.5 = 321.5
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