Across
1
Steepness of a line
3
Single numeral from 0 to 9
4
Exact correspondence on both sides
5
Math using letters for unknown values
9
Split into equal parts
10
Number with digits after a point
12
Rectangle with four equal sides
Down
2
Number less than zero
6
U-shaped curve of a quadratic function
7
Mathematical statement of equality
8
Amount of space an object occupies
11
Visual representation of data
13
Line touching circle at one point