Across
1
Number that divides evenly into another
4
Exact correspondence on both sides
5
Line crossing from corner to corner
6
Total distance around a shape
10
The number representing nothing
Down
2
Three-sided polygon
3
Difference between highest and lowest values
4
Collection of distinct elements
7
Rectangle with four equal sides
8
Symbol representing unknown value
9
Visual representation of data
11
Sum divided by count
12
Longest side of a right triangle