Across
1
Visual representation of data
2
Number greater than zero
3
Symbol representing unknown value
4
Exact correspondence on both sides
5
Line crossing from corner to corner
6
Closed shape with straight sides
11
Line touching circle at one point
12
Proven mathematical statement
Down
2
Lines that never intersect
4
Steepness of a line
5
Single numeral from 0 to 9
7
U-shaped curve of a quadratic function
8
Rectangular array of numbers
9
Part of a line with two endpoints
10
Three-sided polygon