Across
1
U-shaped curve of a quadratic function
6
Collection of distinct elements
7
Part of a circle's circumference
8
Three-sided polygon
9
Steepness of a line
12
Comparison of two quantities
13
Reference line in a graph
Down
2
Line touching circle at one point
3
Distance from center to edge of circle
4
Number that divides evenly into another
5
Symbol representing unknown value
10
Total distance around a shape
11
Number less than zero