Across
1
U-shaped curve of a quadratic function
4
Single numeral from 0 to 9
5
Number divisible only by 1 and itself
6
Part of a line with two endpoints
8
Line segment connecting two circle points
9
Mathematical statement of equality
10
Value that does not change
11
Steepness of a line
Down
2
Difference between highest and lowest values
3
Rectangle with four equal sides
4
Line crossing from corner to corner
5
Closed shape with straight sides
7
Total distance around a shape
8
Round shape with all points equidistant