Across
1
Corner point of a polygon
5
Three-sided polygon
6
Round shape with all points equidistant
7
Sum divided by count
8
The number representing nothing
10
Number divisible only by 1 and itself
13
Proven mathematical statement
Down
2
Divisible by two
3
Part of a circle's circumference
4
Number less than zero
9
Number that divides evenly into another
11
Distance from center to edge of circle
12
Power to which a number is raised