Across
1
Round shape with all points equidistant
2
Symbol representing unknown value
4
Number greater than zero
5
Value that does not change
Down
2
Amount of space an object occupies
3
Part of a circle's circumference
6
Longest side of a right triangle
7
The number representing nothing
8
Power to which a number is raised
9
Closed shape with straight sides
10
Collection of distinct elements
11
Distance from center to edge of circle