Across
1
Distance from center to edge of circle
5
Sum divided by count
7
Rectangular array of numbers
8
Collection of distinct elements
11
Part of a line with two endpoints
Down
2
Single numeral from 0 to 9
3
Result of addition
4
Corner point of a polygon
6
Middle value in an ordered dataset
8
Rectangle with four equal sides
9
Reference line in a graph
10
Number that divides evenly into another
12
The number representing nothing
13
Space between two intersecting lines