Across
1
Split into equal parts
4
Exact correspondence on both sides
5
The number representing nothing
6
Distance from center to edge of circle
7
Collection of distinct elements
8
Part of a circle's circumference
9
Math using letters for unknown values
Down
2
Line segment connecting two circle points
3
Sum divided by count
4
System of ordered marks for measuring
10
Number greater than zero
11
Amount of space an object occupies