Across
1
Number divisible only by 1 and itself
3
Rectangle with four equal sides
4
Sum divided by count
6
Part of a whole number
7
Divisible by two
8
Longest side of a right triangle
9
Total distance around a shape
12
Line crossing from corner to corner
Down
2
Part of a circle's circumference
3
Exact correspondence on both sides
5
Difference between highest and lowest values
10
Rectangular array of numbers
11
Round shape with all points equidistant