Across
1
Number with digits after a point
2
Result of addition
4
Power to which a number is raised
5
Number that divides evenly into another
6
Value that does not change
8
The number representing nothing
10
Symbol representing unknown value
11
Single numeral from 0 to 9
Down
2
Steepness of a line
3
Round shape with all points equidistant
7
Part of a circle's circumference
9
Closed shape with straight sides
10
Corner point of a polygon
12
Three-sided polygon
13
Middle value in an ordered dataset