Across
1
Line segment connecting two circle points
4
Math using letters for unknown values
6
Sum divided by count
7
Reference line in a graph
8
Symbol representing unknown value
9
Three-sided polygon
10
Amount of space an object occupies
Down
2
Number with digits after a point
3
Number greater than zero
5
U-shaped curve of a quadratic function
11
Exact correspondence on both sides
12
Divisible by two