Across
1
Part of a line with two endpoints
4
Part of a circle's circumference
7
Closed shape with straight sides
8
Mathematical statement of equality
9
Difference between highest and lowest values
Down
2
Repeated addition
3
Value that does not change
5
Number that divides evenly into another
6
Space between two intersecting lines
10
Total distance around a shape
11
Mathematical rule or equation