Across
1
Part of a line with two endpoints
6
Math using letters for unknown values
8
Comparison of two quantities
9
Space between two intersecting lines
10
Line segment connecting two circle points
11
Distance from center to edge of circle
12
Reference line in a graph
13
Proven mathematical statement
Down
2
Repeated addition
3
Middle value in an ordered dataset
4
System of ordered marks for measuring
5
Line touching circle at one point
7
Single numeral from 0 to 9