Across
1
Line segment connecting two circle points
3
Math using letters for unknown values
4
Total distance around a shape
6
Closed shape with straight sides
Down
2
Part of a circle's circumference
3
Sum divided by count
4
Parts per hundred
5
Result of addition
7
Comparison of two quantities
8
Single numeral from 0 to 9
9
Number divisible only by 1 and itself