Across
1
The number representing nothing
4
Rectangle with four equal sides
5
Power to which a number is raised
7
Result of multiplication
8
Line touching circle at one point
9
Number that divides evenly into another
12
Exact correspondence on both sides
Down
2
Value that does not change
3
Proven mathematical statement
6
System of ordered marks for measuring
9
Part of a whole number
10
Line segment connecting two circle points
11
Three-sided polygon
13
Visual representation of data