Across
1
Divisible by two
3
U-shaped curve of a quadratic function
5
Comparison of two quantities
6
Line crossing from corner to corner
8
Reference line in a graph
9
Distance from center to edge of circle
10
System of ordered marks for measuring
Down
2
Symbol representing unknown value
4
Number less than zero
7
Rectangular array of numbers
11
Closed shape with straight sides
12
Three-sided polygon
13
Result of addition
14
The number representing nothing