Across
1
Proven mathematical statement
5
Mathematical statement of equality
7
Total distance around a shape
8
Collection of distinct elements
9
Distance from center to edge of circle
10
Split into equal parts
13
Lines that never intersect
14
Exact correspondence on both sides
Down
2
Part of a line with two endpoints
3
Line touching circle at one point
4
Longest side of a right triangle
6
Rectangular array of numbers
10
Single numeral from 0 to 9
11
Line crossing from corner to corner
12
Part of a circle's circumference