Across
1
Divisible by two
2
Round shape with all points equidistant
3
Collection of distinct elements
4
Exact correspondence on both sides
7
Rectangular array of numbers
8
The number representing nothing
Down
1
Power to which a number is raised
2
Value that does not change
5
Total distance around a shape
6
Space between two intersecting lines
9
Amount of space an object occupies