Across
1
U-shaped curve of a quadratic function
5
Number less than zero
6
The number representing nothing
7
Total distance around a shape
8
Number divisible only by 1 and itself
9
Proven mathematical statement
12
Parts per hundred
Down
1
Number greater than zero
2
Amount of space an object occupies
3
Exact correspondence on both sides
4
Three-sided polygon
10
Sum divided by count
11
Difference between highest and lowest values