Across
1
Divisible by two
3
U-shaped curve of a quadratic function
6
Exact correspondence on both sides
7
Single numeral from 0 to 9
8
Number less than zero
Down
2
Total distance around a shape
4
Part of a line with two endpoints
5
Repeated addition
9
Lines that never intersect
10
Line crossing from corner to corner
11
Line touching circle at one point
12
Number divisible only by 1 and itself