A math crossword

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Across
  1. 2. 2 triangle faces
  2. 5. half of diameter
  3. 6. the amount of substence or space that an object occupopies
  4. 8. a two demensional figure made up of 2 dimensional shapes
  5. 9. the length multiplied by the width
  6. 10. 2 multiplied by pi multiplied by the radius of the circle
Down
  1. 1. the combined area of the surfaces of an object
  2. 3. 3.14159...
  3. 4. the line passing through the center of the circle
  4. 5. 3d triangle
  5. 7. the outside of a shape