Across
1
Three-sided polygon
5
Number with digits after a point
6
Steepness of a line
8
Middle value in an ordered dataset
10
Line touching circle at one point
13
Split into equal parts
Down
2
System of ordered marks for measuring
3
Value that does not change
4
Repeated addition
7
Rectangle with four equal sides
9
Visual representation of data
11
The number representing nothing
12
Round shape with all points equidistant