Across
1
Line touching circle at one point
4
Line segment connecting two circle points
5
Reference line in a graph
6
Proven mathematical statement
9
Space between two intersecting lines
Down
2
System of ordered marks for measuring
3
The number representing nothing
4
Value that does not change
7
Round shape with all points equidistant
8
Number that divides evenly into another
10
Closed shape with straight sides
11
Math using letters for unknown values
12
Power to which a number is raised