Surface area and volume

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Across
  1. 3. the area around a 3d shape.
  2. 6. a prism like triangle.
  3. 7. a corner of a 3d triangle.
Down
  1. 1. a prism like rectangle.
  2. 2. how much a3d shape can hold.
  3. 4. a line on a 3d shape.
  4. 5. a side of a 3d shape.