Across
1
Difference between highest and lowest values
4
Mathematical rule or equation
6
Distance from center to edge of circle
7
Part of a line with two endpoints
8
Divisible by two
9
Power to which a number is raised
Down
2
Exact correspondence on both sides
3
Line touching circle at one point
5
Proven mathematical statement
10
Sum divided by count
11
Single numeral from 0 to 9
12
Round shape with all points equidistant