Geometry crossword

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Across
  1. 2. An enclosed 2-dimensional shape formed by lines
  2. 3. A 3-sided shape
  3. 6. A round shape
  4. 8. Having a shared center or axis
  5. 9. A straight line that passes through the center of a circle and connects two points on a circle's edge
  6. 10. The amount of space inside a 2-sided shape
  7. 12. A continuous mark
  8. 13. Acute, Obtuse
  9. 14. A 4-sided shape with all equal sides
Down
  1. 1. 2 lines that cross to make 2 right angles
  2. 2. The sum of all edge lengths on a polygon
  3. 4. A 4-sided shape with equivalent opposite sides
  4. 5. 2 lines that never intersect
  5. 7. The distance from the center of a circle to any point on its edge
  6. 11. Where 2 or more lines intersect