Across
1
Math using letters for unknown values
5
Difference between highest and lowest values
6
Round shape with all points equidistant
7
Part of a line with two endpoints
10
Line crossing from corner to corner
Down
1
Space between two intersecting lines
2
Proven mathematical statement
3
Number less than zero
4
Three-sided polygon
8
System of ordered marks for measuring
9
Mathematical rule or equation
11
Reference line in a graph
12
Value that does not change