Circumference of a Circle

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Across
  1. 3. A class I have with Mr. Mais everyday
  2. 4. An object that has no sides or ending
  3. 5. There are _______ parts of a circle
  4. 6. The opposite of division
  5. 9. Replacing one thing for another
Down
  1. 1. Half of the diameter
  2. 2. Stretches from one end of the circle to the next
  3. 4. Something that never changes
  4. 7. An instrument that is used to measure items
  5. 8. A symbol that has the value of 3.14