Across
1
Symbol representing unknown value
5
Line touching circle at one point
6
Comparison of two quantities
7
Line segment connecting two circle points
10
Line crossing from corner to corner
12
Space between two intersecting lines
Down
2
Distance from center to edge of circle
3
Number with digits after a point
4
Parts per hundred
8
The number representing nothing
9
Round shape with all points equidistant
11
Collection of distinct elements