Across
1
Part of a line with two endpoints
3
Distance from center to edge of circle
5
Number that divides evenly into another
7
Single numeral from 0 to 9
8
Line segment connecting two circle points
10
Longest side of a right triangle
Down
2
Total distance around a shape
4
Line touching circle at one point
6
Proven mathematical statement
9
Rectangle with four equal sides
11
Corner point of a polygon
12
Parts per hundred