INESCAPABLE DEATH!!!

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Across
  1. 2. the total amount of cubes that can fit inside a 3D shape
  2. 3. the product of all sides areas added up on a 3D shape
  3. 7. a many sided, closed figure
  4. 8. 3D shape with base of regular polygon
  5. 10. A 3D shape made of flat faces
  6. 13. a triangle with 2 sides the same length
  7. 14. 2 lines or sides that meet and make a 90 degree angle
  8. 15. The unit squares inside a shape
Down
  1. 1. 2 straight lines that cross over each other and make a right angle
  2. 4. a triangle with 3 unequal sides
  3. 5. 2 numbers or letters that symbolize a certain spot on a grid
  4. 6. A 3D shape with a square base and triangular sides that meet at an apex
  5. 9. The top or apex of a shape
  6. 11. The outside surrounding a shape
  7. 12. 3D shape if opened and laid flat.