Across
1
System of ordered marks for measuring
4
Number greater than zero
6
Distance from center to edge of circle
7
Collection of distinct elements
9
Space between two intersecting lines
10
Divisible by two
11
Part of a circle's circumference
Down
1
Result of addition
2
Lines that never intersect
3
Sum divided by count
5
Split into equal parts
8
Line segment connecting two circle points
12
Result of multiplication