Across
1
Exact correspondence on both sides
5
Line segment connecting two circle points
6
U-shaped curve of a quadratic function
7
Lines that never intersect
12
Single numeral from 0 to 9
Down
2
Visual representation of data
3
Mathematical rule or equation
4
Symbol representing unknown value
8
Proven mathematical statement
9
Total distance around a shape
10
System of ordered marks for measuring
11
The number representing nothing