Across
1
Mathematical statement of equality
6
The number representing nothing
7
System of ordered marks for measuring
8
Amount of space an object occupies
9
U-shaped curve of a quadratic function
11
Comparison of two quantities
Down
2
Round shape with all points equidistant
3
Difference between highest and lowest values
4
Reference line in a graph
5
Divisible by two
9
Number divisible only by 1 and itself
10
Number greater than zero