Mathematics (No spaces between words) 2

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Across
  1. 5. Sum of interior angles equals to 360 degrees.
  2. 6. The degree to which two variables are associated.
  3. 7. The Earth
  4. 8. Set of ordered pairs that satisfy a system of inequalities and its constraints.
  5. 13. The square root of two hundred fifty six
Down
  1. 1. A quantity with both direction and magnitude.
  2. 2. Derivative of the area of a circle.
  3. 3. The radius and tangent line of a circle.
  4. 4. Adjacent over Hypotenuse.
  5. 9. System where lines lie on top of each other.
  6. 10. Inverse of an exponent.
  7. 11. A function that fits a set of paired data as closely as possible.
  8. 12. A polyhedron with eight faces.