Across
1
Symbol representing unknown value
5
Value that does not change
6
Corner point of a polygon
10
Difference between highest and lowest values
12
Steepness of a line
Down
2
System of ordered marks for measuring
3
Part of a circle's circumference
4
Mathematical rule or equation
7
Power to which a number is raised
8
Number that divides evenly into another
9
Result of raising a number to an exponent
11
Part of a line with two endpoints
13
Reference line in a graph