Across
1
Line segment connecting two circle points
3
Result of addition
4
Sum divided by count
8
Difference between highest and lowest values
9
Single numeral from 0 to 9
10
Part of a whole number
Down
2
Total distance around a shape
5
Number that divides evenly into another
6
Space between two intersecting lines
7
System of ordered marks for measuring
11
Three-sided polygon