Across
1
Power to which a number is raised
6
Number that divides evenly into another
7
Symbol representing unknown value
9
Rectangular array of numbers
10
Parts per hundred
Down
2
Exact correspondence on both sides
3
Rectangle with four equal sides
4
Mathematical rule or equation
5
Three-sided polygon
8
Line segment connecting two circle points
11
Repeated addition
12
Line touching circle at one point
13
U-shaped curve of a quadratic function