Across
1
Symbol representing unknown value
4
U-shaped curve of a quadratic function
5
Amount of space an object occupies
6
Difference between highest and lowest values
7
Steepness of a line
8
Three-sided polygon
9
Part of a circle's circumference
Down
2
Repeated addition
3
Sum divided by count
4
Lines that never intersect
10
Part of a whole number
11
Single numeral from 0 to 9