Across
1
Total distance around a shape
3
Rectangle with four equal sides
6
Mathematical rule or equation
7
Line touching circle at one point
8
Value that does not change
10
Math using letters for unknown values
11
Divisible by two
Down
2
Difference between highest and lowest values
3
System of ordered marks for measuring
4
Number less than zero
5
Mathematical statement of equality
6
Number that divides evenly into another
9
Distance from center to edge of circle
12
Collection of distinct elements