Across
1
Space between two intersecting lines
4
Collection of distinct elements
5
Part of a whole number
6
Line segment connecting two circle points
7
Three-sided polygon
8
Corner point of a polygon
Down
2
Split into equal parts
3
Single numeral from 0 to 9
4
Steepness of a line
6
Round shape with all points equidistant
9
Mathematical rule or equation