Across
1
Steepness of a line
4
Part of a circle's circumference
5
Proven mathematical statement
7
Number less than zero
8
Mathematical rule or equation
9
Single numeral from 0 to 9
11
Power to which a number is raised
12
Visual representation of data
13
The number representing nothing
Down
2
Lines that never intersect
3
Round shape with all points equidistant
5
Line touching circle at one point
6
Total distance around a shape
10
Symbol representing unknown value