Geometry word scramble

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Across
  1. 4. angles opposite each other when in an x
  2. 6. 4 3D triangles on top of a square
  3. 9. Longest side of a triangle
  4. 11. Next to the angle
  5. 13. A shape with 9 sides
  6. 15. The space inside of a shape
  7. 16. A shape with 3 sides
  8. 17. Across from the angle
  9. 19. Opposite over Hypotenuse
  10. 20. Opposite over Adjacent
Down
  1. 1. The space around a shape
  2. 2. A shape with 8 sides
  3. 3. A shape with 4 sides
  4. 5. Area of a triangle
  5. 7. Theorem named after a Greek philosopher
  6. 8. A shape with 5 sides
  7. 10. A shape with 10 sides
  8. 12. Adjacent over Hypotenuse
  9. 14. A shape with 6 sides
  10. 18. A shape with 4 equal sides