Across
1
Distance from center to edge of circle
2
Symbol representing unknown value
4
Space between two intersecting lines
5
Round shape with all points equidistant
6
Parts per hundred
12
Part of a line with two endpoints
Down
2
Amount of space an object occupies
3
Corner point of a polygon
7
Lines that never intersect
8
U-shaped curve of a quadratic function
9
Number that divides evenly into another
10
The number representing nothing
11
Number less than zero