Across
1
Distance from center to edge of circle
3
Closed shape with straight sides
8
Part of a circle's circumference
9
System of ordered marks for measuring
10
Reference line in a graph
11
Number less than zero
13
Rectangular array of numbers
Down
2
Three-sided polygon
4
Exact correspondence on both sides
5
Visual representation of data
6
Split into equal parts
7
Line crossing from corner to corner
12
Math using letters for unknown values