Across
1
Number with digits after a point
4
Closed shape with straight sides
5
Repeated addition
7
Symbol representing unknown value
9
Result of multiplication
12
Reference line in a graph
Down
2
Number less than zero
3
Lines that never intersect
6
Rectangular array of numbers
8
Steepness of a line
10
Line segment connecting two circle points
11
Middle value in an ordered dataset