Crossword Puzzle

1. a mathematical relationship or rule expressed in symbols.
5. the measurement or extent of something from side to side.
8. points lying in the same straight line.
10. amount of space or a far-off point.
13. related to another so that their product is one.
14. a straight line joining 2 opposite corners of a straight-sided shape.
16. a fixed reference line for the measurement of coordinates.
19. known as the + sign.
20. at right angles to a vertical plane.
22. the plural noun of axis.
25. the length of the perpendicular line from a vertex to the opposite side of a figure.
28. known as the - sign.
29. any set of straight lines passing through one point.
31. the highest point; top or apex.
34. one of the ends of a line segment or interval.
35. a flat or level surface of material object.
37. plural noun of vertex.

2. the exact middle point.
3. the gradient of a graph at any point.
4. at right angles to a horizontal plane.
6. an angle of 90 degrees.
7. in contrast to a square, one with unequal adjacent sides.
9. a 4-sided plane rectilinear figure opposite sides parallel.
11. group of numbers used to indicate the position of a point, line, or plane.
12. having 2 sides of equal length.
15. a decimal point.
16. a space allocated for a specific purpose.
17. the continuous line forming the boundary of a closed geometric figure.
18. identical in form or almost equal.
21. vertical axis of a system of coordinates.
23. something is or may divided.
24. the quality of being long.
26. a plane figure with 3 sides and 3 angles
27. a plane figure with 4 equal straight sides and 4 right angles.
30. branch of mathematics with questions of shape, size, relative position of figures.
32. a parallelogram with 4 opposite equal acute angles, obtuse angles, and 4 equal sides.
33. horizontal axis of a system of coordinates.
36. a straight or curved continuous extent of length without breadth.