Across
1
Proven mathematical statement
5
Symbol representing unknown value
6
Number greater than zero
9
Three-sided polygon
12
Part of a circle's circumference
13
Difference between highest and lowest values
Down
2
Number less than zero
3
Value that does not change
4
Middle value in an ordered dataset
6
Number divisible only by 1 and itself
7
Line crossing from corner to corner
8
Mathematical rule or equation
10
Corner point of a polygon
11
Split into equal parts