Across
1
Number greater than zero
5
Three-sided polygon
6
Line touching circle at one point
7
Result of multiplication
8
Middle value in an ordered dataset
9
Steepness of a line
12
U-shaped curve of a quadratic function
Down
2
Line crossing from corner to corner
3
Math using letters for unknown values
4
Power to which a number is raised
10
Parts per hundred
11
The number representing nothing