Across
1
Symbol representing unknown value
4
Exact correspondence on both sides
5
Rectangle with four equal sides
11
Part of a whole number
13
Parts per hundred
Down
2
Three-sided polygon
3
Amount of space an object occupies
6
U-shaped curve of a quadratic function
7
Distance from center to edge of circle
8
Steepness of a line
9
Comparison of two quantities
10
Number greater than zero
12
Mathematical rule or equation