Across
1
Rectangular array of numbers
4
Longest side of a right triangle
5
Middle value in an ordered dataset
7
Total distance around a shape
10
Power to which a number is raised
13
Mathematical statement of equality
Down
2
Symbol representing unknown value
3
Difference between highest and lowest values
6
Result of multiplication
8
Round shape with all points equidistant
9
The number representing nothing
11
Part of a line with two endpoints
12
Proven mathematical statement