Across
1
Rectangle with four equal sides
4
Power to which a number is raised
6
Part of a circle's circumference
8
Split into equal parts
9
Steepness of a line
Down
1
Exact correspondence on both sides
2
Amount of space an object occupies
3
Number divisible only by 1 and itself
5
Number with digits after a point
7
Line segment connecting two circle points
10
Longest side of a right triangle
11
The number representing nothing
12
Collection of distinct elements