Across
1
Repeated addition
3
Value that does not change
7
Round shape with all points equidistant
8
Sum divided by count
9
Distance from center to edge of circle
10
Exact correspondence on both sides
11
Line touching circle at one point
13
Number greater than zero
Down
1
Middle value in an ordered dataset
2
Line crossing from corner to corner
4
Part of a circle's circumference
5
System of ordered marks for measuring
6
Three-sided polygon
12
Number with digits after a point