Math Crossword

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Across
  1. 2. An angle whose measure is greater than 90 degrees
  2. 3. The property that states a + (b + c) = (a + b) + c
  3. 5. Line segment that begins and ends on a circle
  4. 8. The property that states a + b = b + a
  5. 10. An individual surface
  6. 11. The set of numbers that includes negative numbers, 0, and positive numbers
  7. 12. A corner of a polygon (where two lines meet)
  8. 14. Straight line from one end of a circle to the other that passes through the center
  9. 17. Longest side of a triangle
  10. 19. An angle whose measure is exactly 90 degrees
  11. 20. The property that states a(b + c) = axb + axc
Down
  1. 1. Identical shapes that are the same size
  2. 4. Change in y divided by the change in x
  3. 6. A polygon that has 8 sides
  4. 7. The straight line that forms the border of a shape
  5. 8. The number that gets multiplied by a variable
  6. 9. An angle whose measure is less than 90 degrees
  7. 13. Half of the diameter
  8. 15. The measure of a region's size on a surface
  9. 16. The length of the boundary of a shape
  10. 18. 3.14159...