Across
1
Sum divided by count
2
Total distance around a shape
5
The number representing nothing
7
Result of raising a number to an exponent
8
Divisible by two
9
Corner point of a polygon
10
Round shape with all points equidistant
Down
1
Space between two intersecting lines
2
Number greater than zero
3
Power to which a number is raised
4
Three-sided polygon
6
Part of a circle's circumference