Across
1
Collection of distinct elements
3
Repeated addition
5
Number with digits after a point
6
Part of a circle's circumference
7
Visual representation of data
8
Amount of space an object occupies
11
Result of multiplication
Down
1
Steepness of a line
2
Symbol representing unknown value
3
Rectangular array of numbers
4
Three-sided polygon
9
Reference line in a graph
10
Result of addition
12
The number representing nothing