Across
1
Rectangular array of numbers
4
Amount of space an object occupies
5
Line touching circle at one point
6
Number divisible only by 1 and itself
9
Power to which a number is raised
11
Sum divided by count
12
Middle value in an ordered dataset
13
Line crossing from corner to corner
Down
2
Result of addition
3
Longest side of a right triangle
7
Symbol representing unknown value
8
Space between two intersecting lines
10
Collection of distinct elements