Across
1
Exact correspondence on both sides
2
Line crossing from corner to corner
7
System of ordered marks for measuring
8
Part of a whole number
10
Distance from center to edge of circle
Down
1
Collection of distinct elements
2
Split into equal parts
3
Number divisible only by 1 and itself
4
Part of a circle's circumference
5
Lines that never intersect
6
Value that does not change
9
Line segment connecting two circle points