Across
1
The number representing nothing
3
Number less than zero
4
Number with digits after a point
5
Number that divides evenly into another
8
Total distance around a shape
9
Power to which a number is raised
Down
2
Symbol representing unknown value
4
Line crossing from corner to corner
6
Three-sided polygon
7
Part of a line with two endpoints
10
Mathematical statement of equality
11
Number greater than zero