Across
1
Difference between highest and lowest values
5
Reference line in a graph
6
Longest side of a right triangle
9
Part of a whole number
10
Result of addition
11
U-shaped curve of a quadratic function
12
Value that does not change
13
Amount of space an object occupies
Down
2
Power to which a number is raised
3
Exact correspondence on both sides
4
Round shape with all points equidistant
5
Part of a circle's circumference
7
The number representing nothing
8
Lines that never intersect