Across
1
Line touching circle at one point
2
Symbol representing unknown value
4
Exact correspondence on both sides
7
Single numeral from 0 to 9
8
The number representing nothing
9
Split into equal parts
Down
2
Amount of space an object occupies
3
Closed shape with straight sides
4
Rectangle with four equal sides
5
Number greater than zero
6
Power to which a number is raised
10
Number divisible only by 1 and itself