Across
1
System of ordered marks for measuring
4
Line touching circle at one point
5
Number less than zero
8
Steepness of a line
9
Math using letters for unknown values
12
Number that divides evenly into another
Down
2
Sum divided by count
3
Parts per hundred
6
Reference line in a graph
7
Part of a line with two endpoints
9
Part of a circle's circumference
10
Number with digits after a point
11
Mathematical statement of equality