Across
1
Space between two intersecting lines
3
Number divisible only by 1 and itself
4
Exact correspondence on both sides
7
Number less than zero
9
Part of a circle's circumference
10
Steepness of a line
Down
1
Reference line in a graph
2
Number greater than zero
5
Rectangle with four equal sides
6
Three-sided polygon
8
Rectangular array of numbers