Across
1
Part of a circle's circumference
3
Value that does not change
6
Longest side of a right triangle
7
Power to which a number is raised
9
Split into equal parts
12
Proven mathematical statement
Down
2
Parts per hundred
4
Three-sided polygon
5
Part of a line with two endpoints
8
Amount of space an object occupies
10
Closed shape with straight sides
11
Line segment connecting two circle points