Across
1
Symbol representing unknown value
5
Exact correspondence on both sides
6
Round shape with all points equidistant
7
Closed shape with straight sides
8
Space between two intersecting lines
Down
2
Number divisible only by 1 and itself
3
Reference line in a graph
4
Line crossing from corner to corner
9
Visual representation of data
10
Steepness of a line
11
Part of a whole number