Across
1
Power to which a number is raised
6
System of ordered marks for measuring
7
Closed shape with straight sides
8
Number with digits after a point
9
Three-sided polygon
10
Space between two intersecting lines
Down
2
Total distance around a shape
3
Mathematical rule or equation
4
Comparison of two quantities
5
Steepness of a line
11
Proven mathematical statement
12
Parts per hundred
13
Symbol representing unknown value