Mathematics Crossword

2. If the sum of two adjacent angles is 90°, the angles are called _____
4. A linear equation in two variables has _____ solutions
5. The collection of all points in a plane which are at a fixed distance from a fixed point in the plane
9. A straight one dimensional figure having no length or width; can be extended infinitely in both the directions
10. Degree of constant polynomial
11. Three or more points lying on a straight line
14. The total length of the boundary of a figure
17. Area of all the surfaces except the top and bottom of a figure is called _____ surface area
18. Named after Rene Descartes; consists of two perpendicular number lines: x-axis and y-axis
19. The longest chord in the circle

1. A quadrilateral with nine sides
2. Equal in all respects; having eaxctly the same size and shape
3. An expression consisting of variables and coefficients
6. A triangle with two sides equal
7. A polynomial having the highest degree of three
8. A circle divides a plane into ___ parts
12. A point where x-axis and y-axis converge
13. In a parallelogram, opposite angles are _____
15. A category consisting of both rational and irrational numbers
16. A number written in the form of p/q, where p and q are integers and q is not equal to zero