Across
1
Rectangular array of numbers
2
Result of addition
3
Space between two intersecting lines
5
Line touching circle at one point
7
Line crossing from corner to corner
8
Number divisible only by 1 and itself
Down
2
Part of a line with two endpoints
4
Exact correspondence on both sides
6
Distance from center to edge of circle
7
Number with digits after a point
9
Symbol representing unknown value