Across
1
Divisible by two
2
Part of a circle's circumference
4
Closed shape with straight sides
6
Rectangular array of numbers
7
Number divisible only by 1 and itself
8
Exact correspondence on both sides
9
Mathematical statement of equality
Down
2
Sum divided by count
3
Round shape with all points equidistant
4
Lines that never intersect
5
The number representing nothing
10
Number less than zero