Across
1
The number representing nothing
3
Steepness of a line
4
Sum divided by count
5
Closed shape with straight sides
7
Round shape with all points equidistant
8
Longest side of a right triangle
10
Number divisible only by 1 and itself
Down
2
Visual representation of data
3
Part of a line with two endpoints
6
Lines that never intersect
9
Symbol representing unknown value