Across
1
Round shape with all points equidistant
3
Number less than zero
4
Repeated addition
7
Corner point of a polygon
9
Parts per hundred
11
Amount of space an object occupies
12
The number representing nothing
Down
1
Line segment connecting two circle points
2
Power to which a number is raised
5
Sum divided by count
6
Part of a line with two endpoints
7
Symbol representing unknown value
8
Number greater than zero
10
Rectangle with four equal sides