Find the length x width for every face and add them all up. Your unit would be cubed.
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To find the area of a rectangle, multiply the length times the width. The result will be in square inches.
rectangle and octahedron
Rectangle Surface Area: L X W X 6 (the number of sides)
You find the area of each face and add the results together.
Yes, LxW=Area. For Surface Area, add up the area of all the sides