Across
1
Middle value in an ordered dataset
3
Number that divides evenly into another
5
Space between two intersecting lines
6
Three-sided polygon
9
Number less than zero
12
Total distance around a shape
Down
2
U-shaped curve of a quadratic function
4
Number with digits after a point
7
Number greater than zero
8
Value that does not change
10
Exact correspondence on both sides
11
Steepness of a line