Across
1
Rectangle with four equal sides
4
The number representing nothing
5
Mathematical statement of equality
9
Difference between highest and lowest values
10
Middle value in an ordered dataset
11
Proven mathematical statement
12
Round shape with all points equidistant
Down
1
Result of addition
2
Result of multiplication
3
Distance from center to edge of circle
6
Split into equal parts
7
Total distance around a shape
8
Space between two intersecting lines