Across
1
Part of a line with two endpoints
5
Symbol representing unknown value
8
Single numeral from 0 to 9
9
Line touching circle at one point
11
Number less than zero
12
Mathematical statement of equality
13
Divisible by two
Down
2
Amount of space an object occupies
3
Space between two intersecting lines
4
Corner point of a polygon
6
Parts per hundred
7
Middle value in an ordered dataset
10
Value that does not change