Mathematics Crossword

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Across
  1. 2. If the sum of two adjacent angles is 90°, the angles are called _____
  2. 4. A linear equation in two variables has _____ solutions
  3. 5. The collection of all points in a plane which are at a fixed distance from a fixed point in the plane
  4. 9. A straight one dimensional figure having no length or width; can be extended infinitely in both the directions
  5. 10. Degree of constant polynomial
  6. 11. Three or more points lying on a straight line
  7. 14. The total length of the boundary of a figure
  8. 17. Area of all the surfaces except the top and bottom of a figure is called _____ surface area
  9. 18. Named after Rene Descartes; consists of two perpendicular number lines: x-axis and y-axis
  10. 19. The longest chord in the circle
Down
  1. 1. A quadrilateral with nine sides
  2. 2. Equal in all respects; having eaxctly the same size and shape
  3. 3. An expression consisting of variables and coefficients
  4. 6. A triangle with two sides equal
  5. 7. A polynomial having the highest degree of three
  6. 8. A circle divides a plane into ___ parts
  7. 12. A point where x-axis and y-axis converge
  8. 13. In a parallelogram, opposite angles are _____
  9. 15. A category consisting of both rational and irrational numbers
  10. 16. A number written in the form of p/q, where p and q are integers and q is not equal to zero