Across
1
Number with digits after a point
6
Symbol representing unknown value
9
System of ordered marks for measuring
12
Longest side of a right triangle
13
Part of a circle's circumference
Down
2
Number that divides evenly into another
3
Reference line in a graph
4
Result of addition
5
Middle value in an ordered dataset
7
Space between two intersecting lines
8
Difference between highest and lowest values
10
Value that does not change
11
Number less than zero