Across
1
Round shape with all points equidistant
5
Lines that never intersect
6
Math using letters for unknown values
9
Number divisible only by 1 and itself
11
Distance from center to edge of circle
Down
2
Part of a circle's circumference
3
Rectangle with four equal sides
4
Line crossing from corner to corner
6
Space between two intersecting lines
7
Proven mathematical statement
8
Single numeral from 0 to 9
10
U-shaped curve of a quadratic function