Across
1
Line segment connecting two circle points
3
Line crossing from corner to corner
4
Exact correspondence on both sides
7
Longest side of a right triangle
9
Single numeral from 0 to 9
Down
2
Three-sided polygon
5
Amount of space an object occupies
6
Number divisible only by 1 and itself
8
Line touching circle at one point
10
Reference line in a graph