Across
1
U-shaped curve of a quadratic function
3
Number divisible only by 1 and itself
5
Round shape with all points equidistant
8
Reference line in a graph
10
Value that does not change
11
Number less than zero
12
Repeated addition
13
Part of a line with two endpoints
Down
2
Part of a whole number
3
Number greater than zero
4
Distance from center to edge of circle
6
Difference between highest and lowest values
7
Parts per hundred
9
Three-sided polygon