Across
1
Rectangular array of numbers
3
Math using letters for unknown values
4
Mathematical statement of equality
5
Symbol representing unknown value
10
Line segment connecting two circle points
12
Value that does not change
Down
1
Middle value in an ordered dataset
2
Corner point of a polygon
6
Line crossing from corner to corner
7
Closed shape with straight sides
8
Three-sided polygon
9
Collection of distinct elements
11
Number that divides evenly into another