Across
1
Round shape with all points equidistant
4
Space between two intersecting lines
5
Middle value in an ordered dataset
6
Proven mathematical statement
9
U-shaped curve of a quadratic function
10
Parts per hundred
11
Reference line in a graph
12
Three-sided polygon
Down
2
Distance from center to edge of circle
3
Power to which a number is raised
7
Single numeral from 0 to 9
8
Number less than zero