Across
1
Round shape with all points equidistant
2
Number divisible only by 1 and itself
4
Longest side of a right triangle
10
Space between two intersecting lines
Down
2
Result of raising a number to an exponent
3
The number representing nothing
5
Single numeral from 0 to 9
6
Divisible by two
7
Part of a line with two endpoints
8
Amount of space an object occupies
9
Collection of distinct elements