Across
1
Collection of distinct elements
3
Line crossing from corner to corner
7
Three-sided polygon
8
Mathematical statement of equality
10
Distance from center to edge of circle
11
Mathematical rule or equation
Down
2
Rectangular array of numbers
4
Number that divides evenly into another
5
Math using letters for unknown values
6
Reference line in a graph
9
Part of a whole number
12
Proven mathematical statement