Across
1
Closed shape with straight sides
4
Single numeral from 0 to 9
5
Line segment connecting two circle points
6
Reference line in a graph
7
Sum divided by count
8
The number representing nothing
10
Number that divides evenly into another
Down
1
Number divisible only by 1 and itself
2
Number less than zero
3
Number with digits after a point
9
Corner point of a polygon