Across
1
The number representing nothing
4
Space between two intersecting lines
6
Corner point of a polygon
7
Part of a circle's circumference
8
Math using letters for unknown values
9
Reference line in a graph
10
Number divisible only by 1 and itself
Down
2
Sum divided by count
3
Mathematical rule or equation
5
Rectangle with four equal sides
10
Total distance around a shape
11
Line crossing from corner to corner