Across
1
Closed shape with straight sides
5
Lines that never intersect
6
Reference line in a graph
7
Corner point of a polygon
10
Round shape with all points equidistant
Down
2
Steepness of a line
3
The number representing nothing
4
Line crossing from corner to corner
5
Result of multiplication
8
Exact correspondence on both sides
9
Single numeral from 0 to 9