Across
1
Steepness of a line
4
Rectangular array of numbers
5
Result of addition
6
Collection of distinct elements
7
Divisible by two
9
Proven mathematical statement
10
Exact correspondence on both sides
11
Round shape with all points equidistant
13
Visual representation of data
Down
2
Reference line in a graph
3
Total distance around a shape
8
Single numeral from 0 to 9
12
Number divisible only by 1 and itself