Across
1
Part of a line with two endpoints
4
Line segment connecting two circle points
6
Reference line in a graph
7
Number with digits after a point
8
Number divisible only by 1 and itself
9
Repeated addition
10
Closed shape with straight sides
12
Rectangle with four equal sides
Down
2
Number less than zero
3
Number greater than zero
5
Proven mathematical statement
11
Sum divided by count