Across
1
Distance from center to edge of circle
4
Line crossing from corner to corner
5
Divisible by two
6
Three-sided polygon
10
Power to which a number is raised
12
Reference line in a graph
Down
2
Number greater than zero
3
The number representing nothing
7
System of ordered marks for measuring
8
Space between two intersecting lines
9
Symbol representing unknown value
11
Total distance around a shape