Across
1
Rectangular array of numbers
4
Mathematical statement of equality
7
Distance from center to edge of circle
8
The number representing nothing
10
Collection of distinct elements
Down
2
Part of a circle's circumference
3
Rectangle with four equal sides
5
Result of raising a number to an exponent
6
Middle value in an ordered dataset
9
Part of a line with two endpoints
11
Number that divides evenly into another
12
Repeated addition
13
Sum divided by count