Across
1
Round shape with all points equidistant
3
Part of a line with two endpoints
5
Total distance around a shape
7
Part of a circle's circumference
8
Result of raising a number to an exponent
10
Sum divided by count
12
Number less than zero
Down
2
Single numeral from 0 to 9
3
Rectangle with four equal sides
4
Result of multiplication
6
Line segment connecting two circle points
9
Mathematical statement of equality
11
Exact correspondence on both sides