Across
1
Line touching circle at one point
4
The number representing nothing
6
Rectangle with four equal sides
9
Divisible by two
10
Number greater than zero
11
Collection of distinct elements
12
Number with digits after a point
Down
2
Number less than zero
3
Corner point of a polygon
5
Three-sided polygon
7
Value that does not change
8
Result of multiplication
9
Mathematical statement of equality