Sports Bag

Why not give surface area of cylinders a sporting chance in your classroom? A strategic problem-solving task requires pupils to consider the net of a cylinder. Individuals must determine the sizes of the pieces needed to make a sports bag, including the amount needed for the seams. They then figure out the least amount of material needed in order to cut out the pieces.

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CCSS: Designed
Instructional Ideas

  • Build the bag from the sizes given in the answer so the class can see that it actually does work
  • Have a discussion on why the rectangular piece should not be 64 cm by 95 cm, using 29 cm as the diameter of the round end
Classroom Considerations

  • Surface area of cylinders is not directly contained in the CCSS, but pupils should be able to determine that the rectangular piece must go around the circumference of the circle

  • The resource provides analyzed work that may be similar to work you see from your class
  • The rubric provides suggestions on how to split the points for each portion of the answer

  • The key shows how to lay out the pieces on a one-meter piece of cloth, though the answer for the question is that it would fit on 83 cm of cloth
Common Core