Across
1
Rectangular array of numbers
4
Distance from center to edge of circle
5
System of ordered marks for measuring
6
Line touching circle at one point
10
Steepness of a line
13
Lines that never intersect
Down
2
Difference between highest and lowest values
3
Number with digits after a point
5
Part of a line with two endpoints
7
Repeated addition
8
Total distance around a shape
9
Sum divided by count
11
Reference line in a graph
12
Number greater than zero