Across
1
Part of a line with two endpoints
4
Mathematical rule or equation
7
Corner point of a polygon
8
Number that divides evenly into another
9
Three-sided polygon
11
Split into equal parts
Down
2
Line touching circle at one point
3
Middle value in an ordered dataset
5
Result of addition
6
Part of a whole number
10
Distance from center to edge of circle
12
Repeated addition
13
Lines that never intersect