Across
1
Number that divides evenly into another
3
Collection of distinct elements
4
Number greater than zero
5
Corner point of a polygon
7
Total distance around a shape
9
Mathematical statement of equality
10
Result of addition
13
Space between two intersecting lines
Down
2
Round shape with all points equidistant
3
Exact correspondence on both sides
6
Single numeral from 0 to 9
8
Line touching circle at one point
11
Lines that never intersect
12
Mathematical rule or equation