Across
1
Number less than zero
4
Part of a line with two endpoints
7
Mathematical rule or equation
8
Round shape with all points equidistant
9
Middle value in an ordered dataset
Down
2
Difference between highest and lowest values
3
Collection of distinct elements
4
Steepness of a line
5
Symbol representing unknown value
6
Line crossing from corner to corner
10
Exact correspondence on both sides