Across
1
Space between two intersecting lines
3
Result of addition
6
Math using letters for unknown values
7
Distance from center to edge of circle
8
Comparison of two quantities
13
Result of multiplication
Down
2
Mathematical rule or equation
4
Reference line in a graph
5
Symbol representing unknown value
9
Value that does not change
10
Collection of distinct elements
11
Difference between highest and lowest values
12
Single numeral from 0 to 9