Across
1
Line crossing from corner to corner
2
Collection of distinct elements
3
Power to which a number is raised
8
The number representing nothing
9
Round shape with all points equidistant
Down
2
Steepness of a line
4
Closed shape with straight sides
5
Total distance around a shape
6
Proven mathematical statement
7
Result of multiplication
10
Mathematical rule or equation
11
Part of a whole number
12
Single numeral from 0 to 9