Geometry crossword

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Across
  1. 6. the distance between one point of the circle to another(has to pass the middle)
  2. 11. 3D shape with circular base and curved surface pointed towards the top
  3. 13. used to find the unknown side of a right triangle
  4. 15. Lines that never meet
Down
  1. 1. a shape that has 3 acute angles
  2. 2. the amount of space in a 3D object
  3. 3. part of a line connected by two end points
  4. 4. angles that are opposite of each other when two lines cross
  5. 5. polygon with 10 sides
  6. 7. when 2 angles sum up to 90 degrees
  7. 8. the circular movement of an object around a center
  8. 9. angle greater than 90 degrees
  9. 10. the ratio of the circumference of any circle to the diameter of that circle
  10. 12. the distance from the center to the surface of a circle
  11. 14. a part of a line that continues on forever from its endpoint