Across
1
Space between two intersecting lines
2
Number greater than zero
3
U-shaped curve of a quadratic function
4
Longest side of a right triangle
5
Rectangle with four equal sides
6
Number less than zero
7
Mathematical rule or equation
8
Difference between highest and lowest values
10
Part of a whole number
11
Number with digits after a point
Down
1
Sum divided by count
2
Lines that never intersect
3
Closed shape with straight sides
9
Proven mathematical statement