Across
1
Math using letters for unknown values
4
Power to which a number is raised
7
Number greater than zero
8
Line touching circle at one point
9
Reference line in a graph
10
Number with digits after a point
11
Rectangular array of numbers
Down
1
Part of a circle's circumference
2
U-shaped curve of a quadratic function
3
Lines that never intersect
5
Number less than zero
6
Comparison of two quantities
12
Split into equal parts
13
Longest side of a right triangle