Math crossword

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Across
  1. 3. What type of angle is smaller than 90 degrees?
  2. 5. Mad
  3. 6. Whole number
  4. 11. Perdiction
  5. 13. What is alike? 5x+9=7x
  6. 15. spin
  7. 16. Radical sign
  8. 19. Recurring
  9. 20. What point is on the vertical line.
Down
  1. 1. a2+b2=c2
  2. 2. All the measure ments on the lines around the shape
  3. 4. The point to the middle
  4. 7. Half of a round object
  5. 8. The begining of the problem
  6. 9. The __ is horzontal
  7. 10. smaller
  8. 12. Don't call me after __.
  9. 14. Combined Together
  10. 17. Added all together
  11. 18. variable change