Math crossword puzzle

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Across
  1. 5. space inside a 3D object
  2. 7. Multiple both sides
  3. 10. the blue app that u calculate on
  4. 13. Enlarge or reduce
  5. 15. how tall are you
  6. 16. the bottom of the shape
  7. 17. congruent
  8. 18. up and down
  9. 20. flip
Down
  1. 1. angle supplementary
  2. 2. the real number system
  3. 3. add up all sides
  4. 4. something that doesn’t cross
  5. 6. side to side
  6. 8. linear
  7. 9. Simplify an algebraic expression
  8. 11. you would slid to a point
  9. 12. how wide are u
  10. 14. real number system and negative numbers only
  11. 19. rotate to a point