Across
1
Space between two intersecting lines
4
Round shape with all points equidistant
5
Lines that never intersect
6
Number greater than zero
8
Split into equal parts
11
Three-sided polygon
12
System of ordered marks for measuring
13
Line segment connecting two circle points
Down
1
Part of a circle's circumference
2
Divisible by two
3
Number less than zero
7
Result of multiplication
9
Distance from center to edge of circle
10
Repeated addition