Across
1
Number less than zero
4
Part of a line with two endpoints
6
Sum divided by count
10
Part of a circle's circumference
Down
2
Symbol representing unknown value
3
Number with digits after a point
4
Steepness of a line
5
Single numeral from 0 to 9
7
Visual representation of data
8
Corner point of a polygon
9
Total distance around a shape