Across
1
Line touching circle at one point
3
Mathematical rule or equation
5
System of ordered marks for measuring
6
Exact correspondence on both sides
8
Symbol representing unknown value
9
Difference between highest and lowest values
Down
2
Mathematical statement of equality
3
Number that divides evenly into another
4
Lines that never intersect
6
Part of a line with two endpoints
7
Part of a circle's circumference
10
Split into equal parts
11
Single numeral from 0 to 9
12
Reference line in a graph