Across
1
Part of a line with two endpoints
2
Part of a circle's circumference
7
Collection of distinct elements
8
Space between two intersecting lines
9
Closed shape with straight sides
Down
2
Reference line in a graph
3
Part of a whole number
4
Three-sided polygon
5
Power to which a number is raised
6
Rectangular array of numbers
10
Steepness of a line