Geometry

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Across
  1. 3. Axis
  2. 4. in the same straight line
  3. 5. angle 90 degrees
  4. 6. intersects the y axis
  5. 8. opposite/hypotenuse
  6. 9. a2+b2=c2
  7. 12. 2 equal sides
  8. 14. 4 sided shape
  9. 15. with numbers number line
  10. 16. curve of a circle
  11. 17. across
  12. 18. where two surfaces join
Down
  1. 1. Round
  2. 2. add all sides
  3. 3. next to
  4. 5. Diamond
  5. 7. lines that never intersect
  6. 10. flat surface
  7. 11. 2 equal parts
  8. 13. the same