Across
1
Distance from center to edge of circle
4
Divisible by two
5
Longest side of a right triangle
8
Value that does not change
9
Number greater than zero
10
Number less than zero
14
Repeated addition
Down
2
Collection of distinct elements
3
Split into equal parts
6
Line touching circle at one point
7
Rectangle with four equal sides
11
Result of addition
12
Parts per hundred
13
Exact correspondence on both sides
15
Sum divided by count