Across
1
Total distance around a shape
6
Mathematical rule or equation
7
Parts per hundred
8
Steepness of a line
10
Reference line in a graph
11
Line segment connecting two circle points
Down
1
Lines that never intersect
2
System of ordered marks for measuring
3
Part of a line with two endpoints
4
Rectangular array of numbers
5
Part of a circle's circumference
9
Number greater than zero
12
Number with digits after a point
13
Collection of distinct elements