Across
1
Value that does not change
4
Reference line in a graph
6
Amount of space an object occupies
7
Mathematical rule or equation
9
Comparison of two quantities
10
The number representing nothing
11
Middle value in an ordered dataset
12
Rectangle with four equal sides
15
Number less than zero
Down
2
Line touching circle at one point
3
U-shaped curve of a quadratic function
5
Result of multiplication
8
Exact correspondence on both sides
13
Three-sided polygon
14
Difference between highest and lowest values