Across
1
Part of a whole number
3
Sum divided by count
6
System of ordered marks for measuring
7
Reference line in a graph
8
Proven mathematical statement
9
Corner point of a polygon
11
Parts per hundred
12
Line crossing from corner to corner
Down
2
Exact correspondence on both sides
3
Space between two intersecting lines
4
Part of a line with two endpoints
5
Value that does not change
10
Amount of space an object occupies
13
Number less than zero