Across
1
Line segment connecting two circle points
3
Divisible by two
4
Lines that never intersect
7
Distance from center to edge of circle
8
Rectangle with four equal sides
10
Steepness of a line
Down
2
System of ordered marks for measuring
4
Closed shape with straight sides
5
The number representing nothing
6
Corner point of a polygon
9
Round shape with all points equidistant