Across
1
Total distance around a shape
6
Corner point of a polygon
7
Three-sided polygon
8
Mathematical statement of equality
9
Rectangular array of numbers
Down
2
Difference between highest and lowest values
3
The number representing nothing
4
Math using letters for unknown values
5
Split into equal parts
10
Line crossing from corner to corner
11
Number less than zero
12
Middle value in an ordered dataset