Across
1
Amount of space an object occupies
2
Collection of distinct elements
4
Number less than zero
5
The number representing nothing
6
Symbol representing unknown value
10
Round shape with all points equidistant
Down
2
Exact correspondence on both sides
3
Steepness of a line
7
Line segment connecting two circle points
8
Proven mathematical statement
9
Result of raising a number to an exponent