Across
1
Rectangular array of numbers
3
Divisible by two
4
Amount of space an object occupies
5
Collection of distinct elements
7
Rectangle with four equal sides
9
Single numeral from 0 to 9
Down
2
Total distance around a shape
6
Symbol representing unknown value
8
Corner point of a polygon
10
Longest side of a right triangle
11
Number divisible only by 1 and itself