Across
1
Divisible by two
4
Steepness of a line
5
Line segment connecting two circle points
6
Total distance around a shape
11
Power to which a number is raised
13
Sum divided by count
14
Difference between highest and lowest values
15
Lines that never intersect
Down
2
Space between two intersecting lines
3
Longest side of a right triangle
7
Rectangular array of numbers
8
Value that does not change
9
Number that divides evenly into another
10
Part of a line with two endpoints
12
The number representing nothing