Across
1
Space between two intersecting lines
3
Line segment connecting two circle points
4
Number that divides evenly into another
5
Exact correspondence on both sides
9
Three-sided polygon
11
Line touching circle at one point
12
Part of a line with two endpoints
Down
2
Proven mathematical statement
5
Result of addition
6
Mathematical rule or equation
7
Result of multiplication
8
Part of a circle's circumference
10
Divisible by two