Across
1
Exact correspondence on both sides
4
Power to which a number is raised
6
Lines that never intersect
12
Distance from center to edge of circle
13
System of ordered marks for measuring
14
Steepness of a line
Down
2
The number representing nothing
3
Symbol representing unknown value
5
Middle value in an ordered dataset
7
Longest side of a right triangle
8
Comparison of two quantities
9
Number less than zero
10
Total distance around a shape
11
Rectangular array of numbers