Across
1
Number divisible only by 1 and itself
3
Part of a circle's circumference
4
Three-sided polygon
6
Steepness of a line
9
Comparison of two quantities
11
Proven mathematical statement
12
Number less than zero
Down
1
Number greater than zero
2
Mathematical statement of equality
5
The number representing nothing
7
Part of a whole number
8
Mathematical rule or equation
10
Result of multiplication
13
Lines that never intersect