Across
1
Middle value in an ordered dataset
3
Part of a whole number
4
Number that divides evenly into another
7
Line touching circle at one point
8
Three-sided polygon
9
The number representing nothing
Down
2
U-shaped curve of a quadratic function
5
Number divisible only by 1 and itself
6
Part of a line with two endpoints
10
Space between two intersecting lines
11
Total distance around a shape