Across
1
Number less than zero
4
Line segment connecting two circle points
7
Sum divided by count
8
Exact correspondence on both sides
10
System of ordered marks for measuring
11
Total distance around a shape
12
Three-sided polygon
Down
2
Middle value in an ordered dataset
3
Visual representation of data
5
Number that divides evenly into another
6
Mathematical statement of equality
9
Proven mathematical statement
13
Number divisible only by 1 and itself
14
Part of a line with two endpoints
15
Number with digits after a point