Across
1
Exact correspondence on both sides
4
Power to which a number is raised
6
Number greater than zero
7
Value that does not change
9
System of ordered marks for measuring
12
Three-sided polygon
13
Space between two intersecting lines
14
Part of a circle's circumference
Down
2
Number less than zero
3
Rectangular array of numbers
5
Distance from center to edge of circle
8
Symbol representing unknown value
10
The number representing nothing
11
U-shaped curve of a quadratic function