Across
1
Part of a circle's circumference
3
Total distance around a shape
4
Rectangular array of numbers
5
Corner point of a polygon
8
Round shape with all points equidistant
10
Single numeral from 0 to 9
Down
2
Number less than zero
6
Part of a line with two endpoints
7
Number divisible only by 1 and itself
9
Difference between highest and lowest values
11
Line crossing from corner to corner