Across
1
Proven mathematical statement
2
U-shaped curve of a quadratic function
7
Difference between highest and lowest values
8
Round shape with all points equidistant
10
The number representing nothing
11
Number divisible only by 1 and itself
Down
2
Lines that never intersect
3
Mathematical rule or equation
4
Number with digits after a point
5
Collection of distinct elements
6
Steepness of a line
9
Line crossing from corner to corner