Across
1
Distance from center to edge of circle
4
Rectangle with four equal sides
6
Closed shape with straight sides
7
Line touching circle at one point
8
Parts per hundred
11
The number representing nothing
13
Part of a circle's circumference
Down
2
Round shape with all points equidistant
3
Part of a line with two endpoints
5
Line segment connecting two circle points
9
Number less than zero
10
Mathematical statement of equality
12
Part of a whole number