You find the area of each face and add the results together.
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rectangle and octahedron
Rectangle Surface Area: L X W X 6 (the number of sides)
Yes, LxW=Area. For Surface Area, add up the area of all the sides
Split the cylinder into two circles and a rectangle to find your answer.
Divide the surface area by the circumference of the circle, which is a product of the diameter x Pi. Essentially, an unrolled cylinder is a rectangle.