Across
1
Closed shape with straight sides
4
Mathematical rule or equation
5
Part of a circle's circumference
7
Collection of distinct elements
10
Single numeral from 0 to 9
Down
2
Value that does not change
3
Number that divides evenly into another
6
Line crossing from corner to corner
8
Round shape with all points equidistant
9
Number divisible only by 1 and itself
11
Reference line in a graph