Across
1
Power to which a number is raised
4
Sum divided by count
5
Distance from center to edge of circle
8
Repeated addition
10
Reference line in a graph
11
System of ordered marks for measuring
12
Longest side of a right triangle
13
Collection of distinct elements
Down
2
Number greater than zero
3
Rectangle with four equal sides
6
Proven mathematical statement
7
Math using letters for unknown values
9
The number representing nothing
11
Exact correspondence on both sides