Donald Duck in Mathemagic Land Vocabulary Hunt

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Across
  1. 2. tool for making music
  2. 5. wrote "Mathematics is the alphabet by which God has written the universe"
  3. 7. mathematical number
  4. 11. subject in school concerned with understanding numbers and shapes
  5. 12. parallelogram with 4 right angles
  6. 14. Branch of Mathematics concerned with symbols and the rules for manipulating symbols
  7. 16. the "Father of Mathematics"
  8. 17. rectangle with 4 equal sides
  9. 18. set of all points equidistance from the center
Down
  1. 1. five-pointed star
  2. 3. Branch of Mathematics concerned with relationships between points, lines, planes and solids
  3. 4. game played with three balls
  4. 5. One of the ancient cultures that made significant contributions to Mathematics
  5. 6. Elementary school name for rhombus
  6. 8. the form of an object or outside boundry
  7. 9. an interval whose higher note has a sound-wave frequency of vibration twice that of its lower note
  8. 10. physical world collectively
  9. 13. geometric solid with triangle shaped faces
  10. 15. vocal or instrumental sounds (or both)