math crossword

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Across
  1. 7. a polygon with all angles 90-degrees and opposite sides equal
  2. 10. lines that intersect at a 90-degree angle
  3. 11. the total length around a shape
  4. 12. a 2D layout that folds into a 3D shape
  5. 13. space inside a 2D shape
  6. 14. a 3D shape with a polygon base and triangular sides meeting at a point
  7. 15. the amount of space inside a 3D object
Down
  1. 1. a triangle with two equal sides
  2. 2. triangle all sides different
  3. 3. the total area of the outer surface of a 3D object
  4. 4. a closed shape with straight sides
  5. 5. a 3D shape with 2 parallel, identical bases
  6. 6. numbers that specify a position
  7. 8. an angle of 90-degrees
  8. 9. a point where 2 or more lines or edges meet.