Mathematics (No spaces between words)

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Across
  1. 5. Sum of interiors angles in a Triangle.
  2. 6. Two lines crossing each other.
  3. 8. a^2 + b^2 = c^2
  4. 9. Quadrilateral where all sides are congruent and 90 degree angles.
  5. 10. 1, 4, 9, 16, 25, etc.
  6. 12. Quadratics, Cubics, Quartics, etc.
  7. 13. x^2 + 7x + 12 ---> (x + 3)(x + 4)
  8. 14. Quadrilateral where both pairs of sides are parallel and the diagonals bisect perpendicularly.
  9. 16. Symbol for finding areas under curves.
Down
  1. 1. Distributions having two local maxima.
  2. 2. 1/0, x/0, etc.
  3. 3. Maximum or minimum points of a function.
  4. 4. a(b + c) = ab + ac
  5. 7. Number expressed in a + bi form.
  6. 11. Vertical line that goes through the vertex.
  7. 15. System where lines have the same slope.