Across
1
Proven mathematical statement
4
Single numeral from 0 to 9
6
Number less than zero
9
Corner point of a polygon
10
Result of addition
Down
1
Line touching circle at one point
2
System of ordered marks for measuring
3
Rectangle with four equal sides
4
Number with digits after a point
5
Number divisible only by 1 and itself
7
The number representing nothing
8
Three-sided polygon