Across
1
Distance from center to edge of circle
3
Round shape with all points equidistant
5
Split into equal parts
6
Symbol representing unknown value
7
Collection of distinct elements
Down
2
Number divisible only by 1 and itself
3
Value that does not change
4
Rectangular array of numbers
8
The number representing nothing
9
Lines that never intersect
10
Middle value in an ordered dataset