Across
1
The number representing nothing
3
Number with digits after a point
6
U-shaped curve of a quadratic function
9
Mathematical rule or equation
11
Reference line in a graph
Down
2
Proven mathematical statement
4
Number that divides evenly into another
5
Closed shape with straight sides
7
Rectangle with four equal sides
8
System of ordered marks for measuring
10
Part of a circle's circumference