Across
1
Distance from center to edge of circle
3
Round shape with all points equidistant
5
Part of a line with two endpoints
7
System of ordered marks for measuring
9
Steepness of a line
Down
2
Result of addition
3
Line segment connecting two circle points
4
Line crossing from corner to corner
6
Lines that never intersect
8
Result of raising a number to an exponent