Across
1
Number greater than zero
4
Exact correspondence on both sides
5
Collection of distinct elements
7
Number with digits after a point
8
Divisible by two
9
Lines that never intersect
Down
2
Round shape with all points equidistant
3
Steepness of a line
4
System of ordered marks for measuring
6
Amount of space an object occupies
10
The number representing nothing