Across
1
Single numeral from 0 to 9
3
Amount of space an object occupies
7
Reference line in a graph
8
Mathematical statement of equality
9
Power to which a number is raised
11
Value that does not change
Down
2
Distance from center to edge of circle
3
Symbol representing unknown value
4
Number less than zero
5
Three-sided polygon
6
The number representing nothing
10
Corner point of a polygon