Across
1
Reference line in a graph
2
Single numeral from 0 to 9
4
Part of a circle's circumference
5
Split into equal parts
7
Mathematical rule or equation
9
Round shape with all points equidistant
Down
2
Number with digits after a point
3
Steepness of a line
6
Line touching circle at one point
8
Divisible by two
10
Value that does not change
11
Corner point of a polygon