Across
1
Split into equal parts
3
Number that divides evenly into another
4
Longest side of a right triangle
6
Mathematical statement of equality
7
Space between two intersecting lines
13
Line touching circle at one point
Down
2
Parts per hundred
5
Number less than zero
8
System of ordered marks for measuring
9
Part of a line with two endpoints
10
Exact correspondence on both sides
11
Collection of distinct elements
12
Proven mathematical statement