math - 3

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Across
  1. 4. Two angles are called _______ when their measures add up to 180 degrees.
  2. 5. Father of numbers.
  3. 7. A nine-sided polygon.
  4. 9. A _______ plane is a two-dimensional coordinate plane formed by the intersection of two perpendicular lines.
  5. 10. The difference between the highest and lowest values.
Down
  1. 1. (a+b)^2= a^2+2ab+b^2 is an ________.
  2. 2. ______ theorem: a^2+b^2=c^2
  3. 3. The sum of exterior angles of any _______ = 360*
  4. 6. Father of mathematics.
  5. 8. The middle value in a list ordered from smallest to largest.