Across
1
Rectangular array of numbers
4
Closed shape with straight sides
5
Round shape with all points equidistant
6
Single numeral from 0 to 9
7
Result of raising a number to an exponent
8
Divisible by two
9
Difference between highest and lowest values
Down
2
Proven mathematical statement
3
Middle value in an ordered dataset
4
Total distance around a shape