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surface area math is fun. So the total surface area is the sum of the areas of all the 6 rectangles. Then they have to figure out the height of the package.
A 2wl 2lh 2hw. Dont forget the two end bits. Area is the size of a surface.
In words the easiest way is to think of a can.
Area is the size of a surface. Area 2 Width Length 2 Length Height 2 Width Height. This video is about finding the Surface Area of Prisms and Pyramids. Part B is a triangle.