Across
1
Number divisible only by 1 and itself
4
Lines that never intersect
5
Steepness of a line
6
Parts per hundred
7
Middle value in an ordered dataset
9
Part of a line with two endpoints
11
Rectangle with four equal sides
13
The number representing nothing
Down
2
Difference between highest and lowest values
3
Longest side of a right triangle
4
Result of raising a number to an exponent
8
Mathematical rule or equation
10
Split into equal parts
12
Reference line in a graph