Across
1
Line crossing from corner to corner
5
Reference line in a graph
6
Difference between highest and lowest values
7
Part of a circle's circumference
10
Number divisible only by 1 and itself
11
Number less than zero
Down
2
Line touching circle at one point
3
Symbol representing unknown value
4
U-shaped curve of a quadratic function
8
Rectangle with four equal sides
9
Split into equal parts