Across
1
Corner point of a polygon
4
Number with digits after a point
6
Distance from center to edge of circle
7
Mathematical statement of equality
8
Single numeral from 0 to 9
9
Steepness of a line
10
Proven mathematical statement
11
Closed shape with straight sides
Down
2
Split into equal parts
3
Middle value in an ordered dataset
5
Value that does not change
12
Longest side of a right triangle