Across
1
Proven mathematical statement
4
Part of a circle's circumference
7
Three-sided polygon
9
Steepness of a line
11
Split into equal parts
12
Divisible by two
Down
2
Number that divides evenly into another
3
Line segment connecting two circle points
5
Round shape with all points equidistant
6
Line touching circle at one point
8
Closed shape with straight sides
10
Rectangle with four equal sides