Math Extra Credit Crossword Puzzle

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Across
  1. 3. a number that is 0 and greater
  2. 4. either of two angles whose sum is 180°.
  3. 7. a number which produces a specified quantity when multiplied by itself.
  4. 8. a triangle with one angle greater than 90 degrees
  5. 9. either of two angles whose sum is 90°.
  6. 10. a line on a plane inclined from a horizontal or vertical line; slant up or down.
  7. 11. the starting point on a graph.
  8. 12. the continuous line forming the boundary of a closed geometric figure.
  9. 15. the process or skill of taking one number or amount away from another.
  10. 16. each of the pairs of opposite angles made by two intersecting lines.
  11. 17. the longest side of a right triangle, opposite the right angle.
  12. 20. a triangle with a right angle.
  13. 21. a quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression
Down
  1. 1. a number less that 0
  2. 2. the amount of space inside the boundary of a flat 2D object
  3. 5. two lines that are the same distance apart and will never cross.
  4. 6. a triangle with all angles less than 90 degrees
  5. 13. the amount of space inside a 3d object
  6. 14. angles that are the same in degrees and radiants
  7. 18. having a constant ratio to another quantity.
  8. 19. a theorem attributed to Pythagoras that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.