Across
1
Result of addition
3
Proven mathematical statement
4
Number less than zero
5
Difference between highest and lowest values
8
Symbol representing unknown value
9
Lines that never intersect
Down
2
Total distance around a shape
6
Collection of distinct elements
7
Line touching circle at one point
8
Amount of space an object occupies
10
Three-sided polygon
11
Visual representation of data
12
Mathematical rule or equation